Answer
$x^{2}+2x+1$
Work Step by Step
From Page 302, we know that the square of a binomial sum $x+y$ is given by the following equation:
$(x+y)^{2}=x^{2}+2xy+y^{2}$
Therefore, $(x+1)^{2}=x^{2}+2(x)(1)+1^{2}=x^{2}+2x+1$.
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