Question

Desenvolva o produto:
$( \frac{xy ^{2} }{a} - \frac{a ^{2} }{x} )^{2}$

Answer 1

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

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

$\frac{x^2y^4}{a^2}- 2y^2a+ \frac{a^4}{x^2}$