Basic Algebra MCQs

Solved Basic Algebra MCQs with answers and explanations. Free practice questions for PPSC, FPSC, CSS and other government job exams on FreeSekho.

1. 1. Solve for x: 7x - 2 = 4x + 13

   1. 5 ✓
   2. 15
   3. 5/3
   4. 11/3

2. 2. If x = 2 and y = 3, evaluate 2x + 3y.

   1. 15
   2. 10
   3. 13 ✓
   4. 12

3. 3. Simplify: (x/y)^3

   1. 3x/y
   2. x/y^3
   3. x^3/y
   4. x^3/y^3 ✓

4. 4. Simplify: (x^3)^2

   1. x^5
   2. x^6 ✓
   3. x^9
   4. 2x^3

5. 5. Simplify: 3x + 4y - x + 2y

   1. 2x + 6y ✓
   2. 2x + 2y
   3. 4x + 6y
   4. 3x + 6y

6. 6. Simplify: 4x + 2(x - 5)

   1. 4x - 10
   2. 6x + 10
   3. 6x - 5
   4. 6x - 10 ✓

7. 7. Expand: (a + b + c)^2 - (a^2 + b^2 + c^2)

   1. a^2+b^2+c^2
   2. 2ab + 2bc + 2ca ✓
   3. 2ab + 2bc
   4. ab + bc + ca

8. 8. Simplify: 2x + 3x^2 - x + x^2

   1. 3x^2 + x
   2. 4x^2 + 2x
   3. 4x^2 + x ✓
   4. 4x^3 + x

9. 9. Expand: (x + 1)^3

   1. x^3 + 3x^2 + 1
   2. x^3 + 1
   3. x^3 + 3x^2 + 3x + 1 ✓
   4. x^3 + 3x + 1

10. 10. Solve: 3x^2 - 12 = 0

    1. x = 2, -2 ✓
    2. x = 4, -4
    3. x = 2, 2
    4. x = 6, -6

11. 11. Add: (3x^2 + 2x + 1) + (x^2 - 3x + 4)

    1. 4x^2 - x + 3
    2. 4x^2 - x + 5 ✓
    3. 4x^2 + x + 5
    4. 2x^2 - x + 5

12. 12. Solve the inequality: 2x - 5 < 9

    1. x < -7
    2. x > 7
    3. x < 2
    4. x < 7 ✓

13. 13. Factorize: x^2 + 5x + 6

    1. (x + 2)(x - 3)
    2. (x + 2)(x + 3) ✓
    3. (x - 2)(x - 3)
    4. (x + 1)(x + 6)

14. 14. If x = 5, evaluate 3x^2 - 2x - 1.

    1. 60
    2. 74
    3. 64 ✓
    4. 54

15. 15. Factorize: 6x^2 + x - 2

    1. (3x + 2)(2x - 1) ✓
    2. (2x + 2)(3x - 1)
    3. (6x + 1)(x - 2)
    4. (3x - 2)(2x + 1)

16. 16. Solve for x: 2x + 5 = 0

    1. -5/2 ✓
    2. 5/2
    3. 2/5
    4. -2/5

17. 17. The sum of two consecutive integers is 25. Find the smaller integer.

    1. 12.5
    2. 13
    3. 11
    4. 12 ✓

18. 18. Solve for x: 2x + 3 = 11

    1. 5.5
    2. 4.5
    3. 4 ✓
    4. 7

19. 19. Solve: 3x - y = 5, x + y = 7. Find x and y.

    1. x=5, y=2
    2. x=4, y=3
    3. x=2, y=5
    4. x=3, y=4 ✓

20. 20. Solve: x + y = 7, 3x + 2y = 17. Find x and y.

    1. x=1, y=6
    2. x=3, y=4 ✓
    3. x=4, y=3
    4. x=5, y=2

21. 21. Simplify: 6a - 4a + 2a

    1. 12a
    2. 4a ✓
    3. 8a
    4. 0

22. 22. Factorize: x^2 - 6x + 9

    1. (x - 3)(x + 3)
    2. (x + 3)^2
    3. x(x - 6)
    4. (x - 3)^2 ✓

23. 23. Solve for x: 5x + 2 = 3x + 10

    1. -4
    2. 4 ✓
    3. 6
    4. 8

24. 24. Solve for x: 2x/3 = 8

    1. 24
    2. 4
    3. 16/3
    4. 12 ✓

25. 25. Factorize: x^2 + 2x + 1

    1. (x + 1)(x - 1)
    2. x(x + 2)
    3. (x + 1)^2 ✓
    4. (x - 1)^2

26. 26. Solve: 2x - y = 1, x + 2y = 8. Find x and y.

    1. x=1, y=1
    2. x=3, y=2
    3. x=2, y=3 ✓
    4. x=4, y=7

27. 27. Divide: (x^2 - 9) / (x - 3)

    1. x + 9
    2. x - 3
    3. x + 3 ✓
    4. x - 9

28. 28. Factorize: x^2 - 16

    1. (x - 4)(x - 4)
    2. (x + 8)(x - 2)
    3. (x + 4)(x - 4) ✓
    4. (x + 4)(x + 4)

29. 29. Solve the inequality: x + 3 > 7

    1. x > 10
    2. x < 4
    3. x > -4
    4. x > 4 ✓

30. 30. Solve for x: 4x - 3 = 2x + 9

    1. 12
    2. -6
    3. 6 ✓
    4. 3

31. 31. Three times a number is 27. Find the number.

    1. 30
    2. 24
    3. 9 ✓
    4. 81

32. 32. Factorize: x^2 + 7x + 12

    1. (x - 3)(x - 4)
    2. (x + 2)(x + 6)
    3. (x + 3)(x + 4) ✓
    4. (x + 1)(x + 12)

33. 33. Simplify using identity: 102^2 - 98^2 (Hint: use a^2 - b^2)

    1. 200
    2. 400
    3. 800 ✓
    4. 10000

34. 34. The sum of a number and 8 is 20. Find the number.

    1. 28
    2. 160
    3. 12 ✓
    4. 2.5

35. 35. Factorize: xy + xz + wy + wz

    1. (x + w)(y + z) ✓
    2. xw(y + z)
    3. (x + y)(w + z)
    4. (x - w)(y - z)

36. 36. Solve: x^2 - 8x + 16 = 0

    1. x = 4, -4
    2. x = 16
    3. x = -4 (repeated)
    4. x = 4 (repeated) ✓

37. 37. Expand: (x - 4)^2

    1. x^2 - 4x + 16
    2. x^2 - 8x + 16 ✓
    3. x^2 + 8x + 16
    4. x^2 - 16

38. 38. Factorize: x^3 - x

    1. x^2(x - 1)
    2. x(x - 1)^2
    3. x(x + 1)(x - 1) ✓
    4. (x + 1)(x - 1)

39. 39. Divide: (6x^3 + 9x^2) / (3x^2)

    1. 2x^2 + 3
    2. 6x + 9
    3. 2x + 3 ✓
    4. 2x + 3x

40. 40. Divide: (x^2 + 5x + 6) / (x + 2)

    1. x - 3
    2. x + 2
    3. x + 3 ✓
    4. x + 6

41. 41. Solve: x^2 - 5x + 6 = 0

    1. x = 1, 6
    2. x = -2, -3
    3. x = 2, 3 ✓
    4. x = 2, -3

42. 42. If x = 3, evaluate x^2 + 2x + 1.

    1. 13
    2. 19
    3. 10
    4. 16 ✓

43. 43. Factor form: a^3 + b^3 equals (a+b) times what?

    1. a^2 + 2ab + b^2
    2. a^2 - ab + b^2 ✓
    3. a^2 + ab + b^2
    4. a^2 - b^2

44. 44. Simplify: x^-2

    1. 1/x^2 ✓
    2. 2/x
    3. -x^2
    4. x^2

45. 45. Simplify: (2x^2)^3

    1. 2x^6
    2. 8x^5
    3. 8x^6 ✓
    4. 6x^6

46. 46. The length of a rectangle is twice its width. If the perimeter is 30, find the width.

    1. 7.5
    2. 15
    3. 5 ✓
    4. 10

47. 47. Solve: x + 2y = 8, x - y = 2. Find x and y.

    1. x=4, y=2 ✓
    2. x=2, y=4
    3. x=6, y=4
    4. x=3, y=1

48. 48. Simplify: (xy)^2

    1. x^2y^2 ✓
    2. 2xy
    3. x^2y
    4. xy^2

49. 49. Simplify: 4x + 3x - 2x

    1. 9x
    2. -x
    3. 5x^2
    4. 5x ✓

50. 50. Solve: x^2 - 9 = 0

    1. x = 3, 3
    2. x = 9, -9
    3. x = 81
    4. x = 3, -3 ✓

51. 51. Factorize by taking out common factor: 3x^2 + 6x

    1. x(3x + 6)
    2. 3(x^2 + 2x)
    3. 3x(x + 2) ✓
    4. 3x(x + 6)

52. 52. Simplify: x^3 * x^4

    1. x^1
    2. x^12
    3. 2x^7
    4. x^7 ✓

53. 53. Twice a number increased by 3 equals 17. Find the number.

    1. 8
    2. 7 ✓
    3. 10
    4. 14

54. 54. Expand: (x + y)(x - y)

    1. x^2 + y^2
    2. x^2 + 2xy - y^2
    3. x^2 - 2xy - y^2
    4. x^2 - y^2 ✓

55. 55. If a = 4 and b = 5, evaluate a^2 - b^2.

    1. -1
    2. 1
    3. 9
    4. -9 ✓

56. 56. Factorize: 4x^2 - 9

    1. (4x + 9)(x - 1)
    2. (2x + 9)(2x - 1)
    3. (2x - 3)(2x - 3)
    4. (2x + 3)(2x - 3) ✓

57. 57. Simplify: a^5 * a^-2

    1. a^7
    2. a^-3
    3. a^-10
    4. a^3 ✓

58. 58. Simplify: x^8 / x^3

    1. x^11
    2. x^5 ✓
    3. x^24/3
    4. x^2

59. 59. Solve for x: 3x - 5 = 10

    1. 5/3
    2. 5 ✓
    3. 3
    4. 15/3

60. 60. Multiply: 2x(3x^2 - 4x + 5)

    1. 6x^3 - 8x^2 + 5x
    2. 6x^3 - 4x^2 + 5x
    3. 6x^2 - 8x^2 + 10x
    4. 6x^3 - 8x^2 + 10x ✓

61. 61. Solve for x: 9 = 3x - 6

    1. 1
    2. 15/3
    3. 5 ✓
    4. -5

62. 62. Factorize: x^2 - 4x

    1. (x - 4)^2
    2. x(x - 4) ✓
    3. 4(x - x)
    4. x(x + 4)

63. 63. Solve: 2x + 3y = 13, x + y = 5. Find x and y.

    1. x=3, y=2
    2. x=2, y=3 ✓
    3. x=4, y=1
    4. x=1, y=4

64. 64. Simplify: 5(2x + 1) - 3x

    1. 7x + 5 ✓
    2. 7x + 1
    3. 13x + 5
    4. 10x + 5

65. 65. Solve the inequality: -2x + 4 > 0

    1. x < -2
    2. x > -2
    3. x > 2
    4. x < 2 ✓

66. 66. The sum of two consecutive even integers is 34. Find the smaller integer.

    1. 15
    2. 16 ✓
    3. 18
    4. 17

67. 67. Multiply: (2x + 1)(x - 4)

    1. 2x^2 - 7x + 4
    2. 2x^2 - 3x - 4
    3. 2x^2 + 7x - 4
    4. 2x^2 - 7x - 4 ✓

68. 68. Expand: (3x - 2y)^2

    1. 9x^2 - 4y^2
    2. 9x^2 - 12xy + 4y^2 ✓
    3. 9x^2 + 12xy + 4y^2
    4. 9x^2 - 6xy + 4y^2

69. 69. Solve for x: 5 - 2x = 1

    1. 6
    2. -2
    3. 2 ✓
    4. 3

70. 70. Solve: x^2 - 7x + 12 = 0

    1. x = 1, 12
    2. x = 2, 6
    3. x = -3, -4
    4. x = 3, 4 ✓

71. 71. Simplify: 7y - 2y

    1. 9y
    2. 14y
    3. 5y^2
    4. 5y ✓

72. 72. Evaluate: 5^0 + 3^0

    1. 0
    2. 1
    3. 2 ✓
    4. 8

73. 73. Simplify: (a^-1)^-3

    1. a^4
    2. a^-4
    3. a^-3
    4. a^3 ✓

74. 74. Solve: x^2 + 5x + 6 = 0

    1. x = -2, -3 ✓
    2. x = 2, -3
    3. x = 2, 3
    4. x = -1, -6

75. 75. Factorize: x^2 + 10x + 25

    1. (x + 5)(x - 5)
    2. (x + 5)^2 ✓
    3. x(x + 10)
    4. (x - 5)^2

76. 76. Solve for x: x/4 + 3 = 7

    1. 28
    2. 16 ✓
    3. 10
    4. 4

77. 77. Simplify: (a^2b^3)^2

    1. a^2b^3
    2. a^4b^5
    3. a^4b^6 ✓
    4. a^2b^6

78. 78. If a + b = 5 and a - b = 1, find a^2 - b^2.

    1. 5 ✓
    2. 1
    3. 6
    4. 25

79. 79. If x - y = 3 and xy = 4, find x^2 + y^2.

    1. 17 ✓
    2. 9
    3. 13
    4. 25

80. 80. If 5 is added to twice a number, the result is 19. Find the number.

    1. 14
    2. 9.5
    3. 12
    4. 7 ✓

81. 81. Solve: x + y = 10, 2x + y = 15. Find x and y.

    1. x=5, y=5 ✓
    2. x=6, y=4
    3. x=5, y=10
    4. x=4, y=6

82. 82. Solve: 2x + y = 7, x - y = 2. Find x and y.

    1. x=2, y=3
    2. x=3, y=1 ✓
    3. x=4, y=-1
    4. x=1, y=3

83. 83. Solve: x - 2y = 1, x + y = 7. Find x and y.

    1. x=3, y=4
    2. x=2, y=5
    3. x=5, y=2 ✓
    4. x=7, y=0

84. 84. Solve: x^2 + 6x + 9 = 0

    1. x = -3 (repeated) ✓
    2. x = 3 (repeated)
    3. x = -3, 3
    4. x = -9

85. 85. Solve: x^2 + 3x = 0

    1. x = 0, -3 ✓
    2. x = 0, 3
    3. x = -3 only
    4. x = 3, -3

86. 86. Solve for x: 6x + 4 = 2x + 20

    1. 6
    2. 3
    3. 16/4
    4. 4 ✓

87. 87. Solve: x^2 - 4x = 0

    1. x = 4, 4
    2. x = 0, 4 ✓
    3. x = 0, -4
    4. x = 2, 2

88. 88. Simplify: 3x^2 + 2x^2 - x^2

    1. 4x^2 ✓
    2. 4x
    3. 4x^4
    4. 6x^2

89. 89. If x + 1/x = 3, find x^2 + 1/x^2.

    1. 6
    2. 7 ✓
    3. 8
    4. 9

90. 90. Solve the inequality: 3x + 2 <= 14

    1. x <= 12
    2. x >= 4
    3. x <= 16/3
    4. x <= 4 ✓

91. 91. Multiply: (x + 2)(x + 5)

    1. x^2 + 7x + 10 ✓
    2. x^2 + 7x + 7
    3. x^2 + 5x + 10
    4. x^2 + 10x + 7

92. 92. Solve: x + 3y = 10, x - y = 2. Find x and y.

    1. x=5, y=3
    2. x=2, y=4
    3. x=6, y=1
    4. x=4, y=2 ✓

93. 93. Expand: (2x + y)(2x - y)

    1. 4x^2 - y^2 ✓
    2. 2x^2 - y^2
    3. 4x^2 - 4xy - y^2
    4. 4x^2 + y^2

94. 94. Factorize: x^2 - 5x + 6

    1. (x - 2)(x + 3)
    2. (x - 1)(x - 6)
    3. (x + 2)(x + 3)
    4. (x - 2)(x - 3) ✓

95. 95. Solve for x: 3(x + 4) - 2(x + 1) = 15

    1. 5 ✓
    2. 3
    3. -5
    4. 25

96. 96. Solve: x^2 - x - 6 = 0

    1. x = 6, -1
    2. x = 3, -2 ✓
    3. x = 3, 2
    4. x = -3, 2

97. 97. Factorize: x^2 - x - 6

    1. (x - 3)(x - 2)
    2. (x + 3)(x - 2)
    3. (x - 3)(x + 2) ✓
    4. (x - 6)(x + 1)

98. 98. Simplify: 7xy - 3xy + 2xy

    1. 6x^2y^2
    2. 12xy
    3. 2xy
    4. 6xy ✓

99. 99. Simplify: 5x - 3y - 2x + 7y

    1. 7x + 4y
    2. 3x - 4y
    3. 3x + 10y
    4. 3x + 4y ✓

100. 100. Factorize: x^2 - 9

     1. (x + 3)(x + 3)
     2. (x + 9)(x - 1)
     3. (x + 3)(x - 3) ✓
     4. (x - 3)(x - 3)

101. 101. Subtract: (5x^2 + 3x - 2) - (2x^2 + x - 5)

     1. 3x^2 + 2x - 3
     2. 3x^2 + 4x + 3
     3. 3x^2 + 2x + 3 ✓
     4. 7x^2 + 4x - 7

102. 102. Multiply: (x - 3)(x + 4)

     1. x^2 + x + 12
     2. x^2 - 7x - 12
     3. x^2 - x - 12
     4. x^2 + x - 12 ✓

103. 103. Evaluate: 2^3 * 2^2

     1. 25
     2. 20
     3. 64
     4. 32 ✓

104. 104. Expand: (a + b)^2

     1. 2a^2 + 2b^2
     2. a^2 - 2ab + b^2
     3. a^2 + 2ab + b^2 ✓
     4. a^2 + b^2

105. 105. Solve for x: 8 - x = 2x - 1

     1. 9
     2. 7/3
     3. 3 ✓
     4. -3

106. 106. Solve: 2x^2 + 3x - 2 = 0

     1. x = 1/2, -2 ✓
     2. x = -1/2, 2
     3. x = 2, -1/2
     4. x = 1, -2

107. 107. Solve: 2x^2 - 8 = 0

     1. x = 8, -8
     2. x = 2, -2 ✓
     3. x = 2, 2
     4. x = 4, -4

108. 108. Factorize: 2x^2 + 5x + 3

     1. (2x - 3)(x - 1)
     2. (2x + 3)(x + 1) ✓
     3. (2x + 1)(x + 3)
     4. (x + 3)(x + 1)

109. 109. Simplify: 2(x + 3) + 4x

     1. 2x + 6
     2. 8x + 6
     3. 6x + 3
     4. 6x + 6 ✓

110. 110. If x = -2, evaluate x^2 - 3x + 4.

     1. -6
     2. 14 ✓
     3. 2
     4. 8

111. 111. Simplify: x^0

     1. 0
     2. x
     3. -1
     4. 1 ✓

112. 112. Solve: x - y = 4, x + y = 12. Find x and y.

     1. x=4, y=8
     2. x=6, y=2
     3. x=10, y=6
     4. x=8, y=4 ✓

113. 113. Expand: (x - 1)^3

     1. x^3 - 3x - 1
     2. x^3 - 1
     3. x^3 - 3x^2 + 3x - 1 ✓
     4. x^3 - 3x^2 - 1

114. 114. Expand: (2x + 3)^2

     1. 4x^2 + 12x + 9 ✓
     2. 4x^2 + 9
     3. 4x^2 + 6x + 9
     4. 2x^2 + 12x + 9

115. 115. The cost of 3 pens is Rs. 45. Find the cost of one pen.

     1. 15 ✓
     2. 45
     3. 135
     4. 9

116. 116. Factor form: a^3 - b^3 equals (a-b) times what?

     1. a^2 - 2ab + b^2
     2. a^2 + ab + b^2 ✓
     3. a^2 - ab + b^2
     4. a^2 - b^2

117. 117. Solve for x: 3x + 7 = 7x - 9

     1. 8
     2. -4
     3. 4 ✓
     4. 16/10

118. 118. Simplify using identity: 105 * 95 (Hint: use (100+5)(100-5))

     1. 9900
     2. 10025
     3. 9975 ✓
     4. 9025

119. 119. If x = 1 and y = -1, evaluate x^2 + y^2 - 2xy.

     1. 4 ✓
     2. -4
     3. 0
     4. 2

120. 120. Factorize: 3x^2 - 5x - 2

     1. (x + 1)(3x - 2)
     2. (3x + 2)(x - 1)
     3. (3x + 1)(x - 2) ✓
     4. (3x - 1)(x + 2)

121. 121. Expand: (x + 5)(x - 5)

     1. x^2 - 5
     2. x^2 - 10x - 25
     3. x^2 + 25
     4. x^2 - 25 ✓

122. 122. Solve: x^2 - 10x + 25 = 0

     1. x = -5 (repeated)
     2. x = 25
     3. x = 5 (repeated) ✓
     4. x = 5, -5

123. 123. Expand: (x - y)^2

     1. x^2 - y^2
     2. x^2 + 2xy + y^2
     3. x^2 - xy + y^2
     4. x^2 - 2xy + y^2 ✓

124. 124. Solve for x: (x + 2)/3 = 5

     1. 17
     2. 15
     3. 13/3
     4. 13 ✓

125. 125. Factorize: x^2 + xy - 6y^2

     1. (x + 6y)(x - y)
     2. (x - 3y)(x + 2y)
     3. (x + 2y)(x - 3y)
     4. (x + 3y)(x - 2y) ✓

126. 126. Solve for x: 2(x + 3) = 3(x - 1)

     1. 15
     2. 9 ✓
     3. -9
     4. 3

127. 127. A father is 3 times as old as his son. The sum of their ages is 48. Find the son's age.

     1. 24
     2. 12 ✓
     3. 36
     4. 16

128. 128. Solve for x: 3(2x + 1) = 21

     1. 3 ✓
     2. 7
     3. 6
     4. 10/3

129. 129. A number decreased by 5 equals 12. Find the number.

     1. 7
     2. 12
     3. 60
     4. 17 ✓

130. 130. Simplify: -3x + 8x - 2x

     1. -13x
     2. -3x
     3. 13x
     4. 3x ✓

131. 131. Expand: (x + y)^2

     1. x^2 + y^2
     2. x^2 + 2xy + y^2 ✓
     3. x^2 - 2xy + y^2
     4. x^2 + xy + y^2

132. 132. Solve: 4x + y = 14, x + y = 5. Find x and y.

     1. x=3, y=2 ✓
     2. x=2, y=3
     3. x=1, y=4
     4. x=4, y=1

133. 133. Simplify: 3(x - 2) - x

     1. 2x - 2
     2. 2x + 6
     3. 4x - 6
     4. 2x - 6 ✓

134. 134. Solve: 2x + y = 11, 3x - y = 9. Find x and y.

     1. x=4, y=3 ✓
     2. x=5, y=1
     3. x=3, y=4
     4. x=2, y=7

135. 135. Simplify: x^6 / x^-2

     1. x^-8
     2. x^4
     3. x^8 ✓
     4. x^3

136. 136. Solve for x: 4(x - 1) = 12

     1. 2
     2. 4 ✓
     3. 13/4
     4. 3

137. 137. Solve for x: 5(x - 2) = 3x + 4

     1. 14/2
     2. -7
     3. 3
     4. 7 ✓

138. 138. Simplify: 9x - (3x + 4)

     1. 6x - 4x
     2. 12x - 4
     3. 6x - 4 ✓
     4. 6x + 4

139. 139. Solve: x^2 + 2x - 15 = 0

     1. x = 5, -3
     2. x = 15, -1
     3. x = 3, -5 ✓
     4. x = -3, 5

140. 140. Solve the inequality: 5 - x >= 2

     1. x >= 3
     2. x <= 3 ✓
     3. x <= 7
     4. x >= -3

141. 141. Factorize: 9x^2 - 12x + 4

     1. (3x - 4)(3x - 1)
     2. (3x - 2)^2 ✓
     3. (3x + 2)^2
     4. (9x - 4)(x - 1)

142. 142. Solve: 3x + y = 10, x + y = 4. Find x and y.

     1. x=2, y=2
     2. x=4, y=0
     3. x=3, y=1 ✓
     4. x=1, y=3

143. 143. Factorize: x^2 - 2xy + y^2

     1. x^2 - y^2
     2. (x + y)^2
     3. (x - y)(x + y)
     4. (x - y)^2 ✓

144. 144. Solve: x + y = 9, x - y = 3. Find x and y.

     1. x=5, y=4
     2. x=7, y=2
     3. x=3, y=6
     4. x=6, y=3 ✓

145. 145. If x + y = 7 and xy = 10, find x^2 + y^2.

     1. 39
     2. 29 ✓
     3. 20
     4. 49

146. 146. Simplify: 3x + 5x

     1. 8x ✓
     2. 2x
     3. 8x^2
     4. 15x

147. 147. Solve for x: x/2 - x/3 = 2

     1. 1/6
     2. 2
     3. 12 ✓
     4. 6

148. 148. Evaluate: 4^-1

     1. 1/4 ✓
     2. -1/4
     3. 4
     4. -4

149. 149. Solve: x^2 - 3x - 10 = 0

     1. x = 5, -2 ✓
     2. x = -5, 2
     3. x = 10, -1
     4. x = 5, 2

150. 150. Solve: x + y = 5, x - y = 1. Find x and y.

     1. x=4, y=1
     2. x=2, y=3
     3. x=3, y=2 ✓
     4. x=1, y=4