Exercises 65-82: Checking Symbolic Skills Solve. Write answers in standard form. 65. x + 5 = 0 66. 4x² + 3 = 0 67. 5x² + 1 = 3x² 68. x(3x + 1) = -1 70. 4x = x - 1 72. 2x + x + 1 = 0 69. 3x = 5x + 1 71. x(x - 4) = -5 73. x = 3x - 5 74. 6x – 2x² = 10 75. x + 2x + 4 = 0 76. x(x – 4) = -8 77. 3x² – 4x = x² - 3 78. 2x² + 3 =1 - x 79. 2x(x – 2) = x - 4 80. 3x? + x = x(5 – x) – 2 81. 3x(3 – x) – 8 = x(x = 2) 82. -x(7 – 2x) = -6 – (3 – x)

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