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Question

Factorise: a2+b24+1+ab+b+2a

A
(a+b2+9)(a+b2+1)
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B
(a+b2+3)(a+b2+2)
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C
(a+b2+3)(a+b2+1)
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D
(a+b2+1)(a+b2+1)
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Solution

The correct option is C (a+b2+1)(a+b2+1)
a2+b24+1+ab+b+2a
=a2+b222+12+2×a×b2+2×b2×1+2×a×1
Using, (a+b+c)2=a2+b2+c2+2ab+2bc+2ca
=(a+b2+1)2
=(a+b2+1)(a+b2+1)

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