-81*y^2 %2B 25*(2*x - y)^2 – InterviewSolution

1.

-81y^2 %2B 25(2*x - y)^2

Answer»

(5(2x-y))^2- (9y)^2using a^2-b^2 =(a+b)(a-b)=(10x-5y+9y)(10x-5y-9y)=(10x+4y)(10x-14y)=2(5x+2y)+2(5x-7y)=2(5x+2y+5x-7y)=2(10x-5y)=2×5(2x-y)=10(2x-y)

10(2x-y) is the correct answer of the given question

100x square -4x square -56y square

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