Evaluate
\left(5x-21\right)\left(5x-11\right)
Expand
25x^{2}-160x+231
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25x^{2}-160x+256-25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-16\right)^{2}.
25x^{2}-160x+231
Subtract 25 from 256 to get 231.
25x^{2}-160x+256-25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-16\right)^{2}.
25x^{2}-160x+231
Subtract 25 from 256 to get 231.
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