Evaluate
\left(20-21x\right)^{2}
Expand
441x^{2}-840x+400
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\left(20-21x\right)^{2}
Add 10 and 10 to get 20.
400-840x+441x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(20-21x\right)^{2}.
\left(20-21x\right)^{2}
Add 10 and 10 to get 20.
400-840x+441x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(20-21x\right)^{2}.
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