Evaluate
-\left(2y-z\right)^{2}+25x^{2}
Expand
25x^{2}-4y^{2}+4yz-z^{2}
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25x^{2}-\left(4y^{2}-4yz+z^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2y-z\right)^{2}.
25x^{2}-4y^{2}+4yz-z^{2}
To find the opposite of 4y^{2}-4yz+z^{2}, find the opposite of each term.
25x^{2}-\left(4y^{2}-4yz+z^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2y-z\right)^{2}.
25x^{2}-4y^{2}+4yz-z^{2}
To find the opposite of 4y^{2}-4yz+z^{2}, find the opposite of each term.
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