Evaluate
\left(5x-8y\right)^{2}
Expand
25x^{2}-80xy+64y^{2}
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\left(5x-8y\right)^{2}
Multiply 5x-8y and 5x-8y to get \left(5x-8y\right)^{2}.
25x^{2}-80xy+64y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-8y\right)^{2}.
\left(5x-8y\right)^{2}
Multiply 5x-8y and 5x-8y to get \left(5x-8y\right)^{2}.
25x^{2}-80xy+64y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-8y\right)^{2}.
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