Question

СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Найдите значение выражения
(5x+7)(3x+7)-(4x+7)^2

Answer 1

$a = 4x+7 \ (a+x)(a-x)-a^2 = a^2-x^2-a^2=-x^2$