(x-4)(x+3)=2x+x во 2 степени

(x - 4)(x + 3) = 2x + x^2x^2 - 4x + 3x - 12 = 2x + x^2x^2 - x - 12 = 2x + x^2x^2 - x^2 - x - 12 = 2x- x - 12 = 2x- x - 2x - 12 = 0-3x - 12 = 0-3x = 12x = -12/3x = -4Ответ: -4.