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- Thread starter scolon94
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I'm still confused because of the -2xy and -2yz. Is it possible to complete the square?Use the given hint allow with the property of associativity to write:

\(\displaystyle \left(x^2-2xy+y^2 \right)+\left(y^2-2yx+z^2 \right)=0\)

Now do you see how to proceed?

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What is the expansion of $(a-b)^2$?I'm still confused because of the -2xy and -2yz. Is it possible to complete the square?

- Jan 29, 2012

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Also [tex]a^2+ b^2= 0[/tex] if and only if a= b= 0.