find the following product using a suìtable identity (7x-9y)(7x-9y) )
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(7x-9y) ²=49x²+81y²-2×7x×9y
=49x²+81y²-126xy
=49x²+81y²-126xy
Answered by
1
(a-b)^2 = (7x-9y)^2=(7x)^2+(9y)^2-2×7x×9y
=49x^2 +81y^2-126xy
=49x^2 +81y^2-126xy
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