Evaluate
-4x\left(2-x\right)
Expand
4x^{2}-8x
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4x^{2}-8x+4-4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-2x+2\right)^{2}.
4x^{2}-8x
Subtract 4 from 4 to get 0.
4x^{2}-8x+4-4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-2x+2\right)^{2}.
4x^{2}-8x
Subtract 4 from 4 to get 0.
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