Question

Помогите!! Срочно!!!

Answer 1

Ответ:

$(b-4)^2 = b^2-8b+16\\(2x+1)^2 = 4x^2+4x+1\\(3 + x)^2 = 9 + x + x^2\\(a+7x)^2 = a^2+14x+49x^2$