In Exercises 75-82, solve each quadratic equation using the quadratic formula. 75. x? + 8x + 15 = 0 76. x + &r + 12 = 0 77. x + 5x + 3 = 0 78. x + 5x + 2 = 0 79. 3x 81. 4x = 2x + 7 ? - 80. 5x + x - 2 = 0 82. 3x = 6x – 1 3x - 4 = 0

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