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Answer E is correct ... Since 2x^y is common in both the terms and we can take it out as follow

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Aug 7th, 2015

given (2x)^3y - (2x)^y

we can write [(2x)^y] ^3 - 2x^y

hence (2x)^y [ (2x)^2y-1]

Aug 7th, 2015

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