Question

Alguem me ajudaa????????

Answer 1

$(\frac{3}{4}x+y)(\frac{3}{4}x-y)\\\\ \frac{3}{4}x.\frac{3}{4}x+\frac{3}{4}x.(-y)+y.\frac{3}{4}x+y.(-y)\\\\ \frac{9}{16}x^2-\frac{3}{4}xy+\frac{3}{4}xy-y^2\\\\ \frac{9}{16}x^2-y^2$