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Question

4a2+b2+4ab+8a+4b+4=?

(a) (2a+b+2)2

(b) (2ab+2)2

(c) (a+2b+2)2

(d) None of these

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Solution

(a) (2a+b+2)2


4a2+b2+4ab+8a+4b+4=4a2+b2+4+4ab+4b+8a=2a2+b2+22+2×2a×b+2×b×2+2×2a×2=(2a+b+2)2


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