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Question

Using apporpriate identity, factorize 9x2+6x+1.

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Solution

9x2+6x+1
=32x2+6x+12
=(3x)2+6x+12
=(3x)2+2(3x)(1)+12
Using identity: (a+b)2=a2+2ab+b2
whereas, a=3x,b=1
=(3x+1)2
=(3x+1)(3x+1)
Hence 9x2+6x+1=(3x+1)(3x+1)

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