Evaluate
\left(5x+8\right)^{2}
Expand
25x^{2}+80x+64
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\left(8+5x\right)^{2}
Add 2 and 6 to get 8.
64+80x+25x^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(8+5x\right)^{2}.
\left(8+5x\right)^{2}
Add 2 and 6 to get 8.
64+80x+25x^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(8+5x\right)^{2}.
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