Expand
4x^{2}-20x-1
Evaluate
\left(2x-5\right)^{2}-26
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4x^{2}-20x+25-26
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-5\right)^{2}.
4x^{2}-20x-1
Subtract 26 from 25 to get -1.
4x^{2}-20x+25-26
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-5\right)^{2}.
4x^{2}-20x-1
Subtract 26 from 25 to get -1.
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