Question

Produtos notáveis (9/4 + x4) (9/4-x4)

Answer 1

$\boxed{(a+b)(a-b)=a^2-b^2}$

$\bigg(\dfrac{9}{4}+x^4\bigg)\bigg(\dfrac{9}{4}-x^4\bigg)=\bigg(\dfrac{9}{4}\bigg)^2-\big(x^4\big)^2=\boxed{\dfrac{81}{16}-x^8}$