find the product using suitable identity : (7x - 9y) (7x - 9y)
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(7x - 9y) (7x - 9y)
= (7x - 9y)^2
Using identity [ (a-b)^2 = a^2 + b^2 - 2ab]
= (7x)^2 + (9y)^2 - 2(7x)(9y)
= 49x^2 + 81y^2 - 126xy
= (7x - 9y)^2
Using identity [ (a-b)^2 = a^2 + b^2 - 2ab]
= (7x)^2 + (9y)^2 - 2(7x)(9y)
= 49x^2 + 81y^2 - 126xy
MannatArora1421:
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49x²+81y²-126xy.... hope it is helpful to you.... please mark me as BRAINLIEST...
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