Question

Qual o resultado da expressão:
(x + b). (x - b) = x(x - b3)​

Answer 1

$\large\boxed{\begin{array}{l}\rm(x+b)\cdot(x-b)=x(x-b^3)\\\rm x^2-b^2=x^2-xb^3\\\rm \diagup\!\!\!\!x^2-\diagup\!\!\!\!x^2+xb^3=b^2\\\rm xb^3=b^2\\\rm x=\dfrac{\diagup\!\!\!\!\!b^2}{\diagup\!\!\!\!\!b^3}\\\\\rm x=\dfrac{1}{b},b\ne0\end{array}}$