Question

(7x+9y)^2+(9x+7y)^2 SIMPLYFY THE FOLLOWING
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Answer 1

Step-by-step explanation:

formula (a+b)^2=a^2+b^2+2×a×b

{(7x)^2+(9y)^2+2×7x×9y}+{(9x)^2+(7y)^2+2×9x×7y}

={49x^2+81y^2+126xy}+{81x^2+49y^2+126xy}

=(49+81)x^2+(91+49)y^2+(126+126)xy

=130x^2+130y^2+252xy

=130(x^2+y^2)+252xy