Evaluate
\left(x+1\right)\left(x+3\right)
Expand
x^{2}+4x+3
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x^{2}+4x+4-1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}+4x+3
Subtract 1 from 4 to get 3.
x^{2}+4x+4-1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}+4x+3
Subtract 1 from 4 to get 3.
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