Expand
16x^{2}-40x+5
Evaluate
\left(4x-5\right)^{2}-20
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16x^{2}-40x+25-20
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-5\right)^{2}.
16x^{2}-40x+5
Subtract 20 from 25 to get 5.
16x^{2}-40x+25-20
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-5\right)^{2}.
16x^{2}-40x+5
Subtract 20 from 25 to get 5.
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