Question

$(2 x - {y}^{3} )^{2}$
por favor 20 pontos pra quem responder certo.​

Answer 1

Vamos lá!

( 2x - y³)² =

( 2x - y³) . ( 2x - y³) =

( 2x . 2x) + ( 2x . - y³) + ( - y³ . 2x) + ( - y³ . - y³) =

4x² - 2xy³ - 2xy³ + y⁶ =

4x² - 4xy³ + y⁶

Answer 2

$\large\boxed{\begin{array}{l}\underline{\rm Quadrado\,da\,diferenc_{\!\!,}a\,de\,dois\,termos}\\\huge\boxed{\boxed{\boxed{\boxed{\sf (a-b)^2=a^2-2ab+b^2}}}}\end{array}}$

$\Large\boxed{\begin{array}{l}\sf(2x-y^3)^2=(2x)^2-2\cdot2x\cdot y^3+(y^3)^2\\\sf (2x-y^3)^2=4x^2-4xy^3+y^6\end{array}}$