Question

выполните умножение двух членов :(x-7)(7-x)

Answer 1

(x - 7)(7 - x) =
= - (x - 7)(x - 7) = 
= - (x - 7)^2 = 
= - (x^2 - 14x + 49) = 
= - x^2 + 14x - 49