Evaluate
\left(z-x\right)^{2}+x^{2}-25
Expand
2x^{2}-2xz+z^{2}-25
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x^{2}+z^{2}-2zx+x^{2}-25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(z-x\right)^{2}.
2x^{2}+z^{2}-2zx-25
Combine x^{2} and x^{2} to get 2x^{2}.
x^{2}+z^{2}-2zx+x^{2}-25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(z-x\right)^{2}.
2x^{2}+z^{2}-2zx-25
Combine x^{2} and x^{2} to get 2x^{2}.
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