Question

(x2-7y)2preciso pra hoje

Answer 1

(x² - 7 y)² = (x²)² - 2 . (x²).7y) + (7y)² = x^4 - 14 x² y + 49 y²

Answer 2

Vamos lá :

$(x^{2} - 7y)^{2} = (x^{2} - 7y)(x^{2}- 7y)\\ \\ ~~~~~~~~~~~~~~=(x^{2})^{2} - 7x^{2}y - 7x^{2}y + (7y)^{2}\\ \\ ~~~~~~~~~~~~~~\boxed{\boxed{=x^{4} - 14x^{2}y + 49y^{2}}}$

Espero ter ajudado !!!