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Question

Factorize: 25x2 + 4y2 + 9z2 − 20xy − 12yz + 30xz.

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Solution

We have:25x2+4y2+9z2-20xy-12yz+30xz=5x2+-2y2+3z2+2(5x)(-2y)+2(-2y)(3z)+2(3z)(5x)=5x+-2y+3z2=5x-2y+3z2

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