Question

Помогите решить
(2x-7)(-2x-7)

Answer 1

(2x-7)(-2x-7) = -(2x-7)(2x+7) = - ($4x^{2}$-49) =  -$4x^{2}$+49

Answer 2

-4x^2-14x+14x+49=-4x+49

Answer 3

=-4x^2+49