English, asked by suresh1234542, 1 year ago

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Answered by Leam

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15. a²-b²-a-b= (a+b)(a-b) -(a-b) = (a+b)(a-b-1) Ans
17.a²-b²+2bc-c²=a²-(b-c)²=(a+b-c)(a-b-c) Answer

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