Question

(7x-9y) ^2+(7x+9y) ^2​

Answer 1

Explanation:

By using identity (a+b)^2 and (a-b)^2

{(7x)^2+(9y)^2 - 126} + {(7x)^2+(9y)^2+126}

{49x^2+81y^2-126+49x^2+81y^2+126}

{98x^2+162y^2}

6(13x^2+27y^2)