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Question

Factorize: 9x2+16y2+4z224xy+16yz12xz

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Solution

We have:9x2+16y2+4z224xy+16yz12xz
=(3x)2+(4y)2+(2z)2+2(3x)(4y)+2(4y)(2z)+2(2z)(3x)
So, it is the form of (a+b+c)2=a2+b2+c2+2ab+2bc+2ca
By replacing a=3x,b=4y,c=2z in the above formula, we get
(3x)2+(4y)2+(2z)2+2(3x)(4y)+2(4y)(2z)+2(2z)(3x)=(3x+4y+2z)2
Therefore, the factors of the given expression is =(3x+4y+2z)2


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