Answer
$$2x^2+5y^2+5z^2+4xy-4xz-8yz=2x^2+4xy-4xz+5y^2-8yz+5z^2$$
Explanation
| $$ \begin{aligned}2x^2+5y^2+5z^2+4xy-4xz-8yz& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^2+4xy-4xz+5y^2-8yz+5z^2\end{aligned} $$ | |
| ① | Combine like terms: $$ 2x^2+4xy-4xz+5y^2-8yz+5z^2 = 2x^2+4xy-4xz+5y^2-8yz+5z^2 $$ |
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