Question

Sabendo que a²+b²=244, e que ab=120 determine o valor de (a-b)

Answer 1

$\large\boxed{\begin{array}{l}\sf(a-b)^2=a^2+b^2-2ab\\\sf (a-b)=244-2\cdot120\\\sf(a-b)^2=244-240\\\sf(a-b)^2=4\\\sf a-b=\sqrt{4}\\\sf a-b=2\end{array}}$