Question

3 contas:

(x^3+y)^2

(2x+3y(2x-3y)

(x+9) (x-9)

Answer 1

Vejamos: 1) (x^3 + y)^2 = x^6 + 2x^3y + y^2 2) (2x + 3).(2x - 3) = 4x^2 - 9 3) (x + 9).(x - 9) = x^2 - 81