Question

Resolva os quadrados da diferença das expressões

A) (4y - 5)²

Answer 1

$\text{Produto not\'avel, quadrado da diferen\c{c}a de dois termos:}\\\\\\(a-b)^2=a^2-2ab+b^2\\\\\\\text{Logo:}\\\\\\(4y-5)^2=4y^2-(2\cdot 4y\cdot 5)+5^2=4y^2-40y+5^2\\\\\\\fbox{\fbox{ 4y^2-40y+25 }}$