Question

помогите срочно даю 20 баллов!!!​

Answer 1

Объяснение:

$(x - 3)(x + 4) - (x - 5)(x + 6) =x^{2}+4x-3x-12-\left(x-5\right)\left(x+6\right) =x^{2}+x-12-\left(x-5\right)\left(x+6\right) =x^{2}+x-12-\left(x^{2}+6x-5x-30\right) =x^{2}+x-12-\left(x^{2}+x-30\right) =x^{2}+x-12-x^{2}-x-\left(-30\right) =x^{2}+x-12-x^{2}-x+30 =x-12-x+30 =-12+30 =18$