Evaluate
4\left(x-1\right)\left(x+2\right)
Expand
4x^{2}+4x-8
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4x^{2}+4x+1-9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+1\right)^{2}.
4x^{2}+4x-8
Subtract 9 from 1 to get -8.
4x^{2}+4x+1-9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+1\right)^{2}.
4x^{2}+4x-8
Subtract 9 from 1 to get -8.
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