Question

simplifique a fração algébrica:
$\frac{4a \: - 4x}{a {}^{2} - {x}^{2} }$

Answer 1

$\frac{4a-4x}{a^2-x^2} =\frac{4(a-x)}{(a+x)(a-x)}=\frac{4}{a+x}$