Question

(a+c).(a-c) desenvolva

Answer 1

$\Large\boxed{\begin{array}{l}\underline{\rm produto\,da\,soma\,pela\,diferenc_{\!\!,}a}\\\underline{\rm\,de\,dois\,termos}\\\sf (a+c)\cdot(a-c)=a^2-c^2\end{array}}$