Question

Решить уравнение −3)(х +7) = (х – 4)(2х +3) + 3 .

Answer 1

$( - 3)(x + 7) = (x - 4)(2x + 3) + 3 \\ - 3x - 21 = 2 {x}^{2} + 3x - 8x - 12 + 3 \\ - 3x - 2 {x}^{2} - 3x + 8x = - 12 + 3 + 21 \\ - 2 {x}^{2} + 2x = 12 \\ {x}^{2} - x = 12 \\ {x}^{2} - x - 12 = 0 \\ (x + 3)(x - 4) = 0 \\ \\ x1 = - 3 \: \: \: \: \: \: \: \: \: \: \: \: \: \: x2 = 4$