Evaluate
\left(5z-9x\right)^{2}
Expand
81x^{2}-90xz+25z^{2}
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\left(5z-9x\right)^{2}
Multiply 5z-9x and 5z-9x to get \left(5z-9x\right)^{2}.
25z^{2}-90zx+81x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5z-9x\right)^{2}.
\left(5z-9x\right)^{2}
Multiply 5z-9x and 5z-9x to get \left(5z-9x\right)^{2}.
25z^{2}-90zx+81x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5z-9x\right)^{2}.
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