75. x – x + 2x² – 4x – 8 = 0 76. 2x + 3x2 + 2x + 3 = 0 77. 3x + 4x2 - 7x + 2 = 0 78. 2x - 3x2 - 3x - 5 = 0 79. 3x - x 15x + 5 = 0 80. 2x - 11x² + 10x + 8 = 0 81. x* + 4x + 2r² – x + 6 = 0 82. x* – 2x + 10x2 – 18x + 9 = 0 2 84. x -x + 3x – 2 = 0 2 8 83. x - +* 3* +1 = 0 3

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