Answer
$a^{2}-6a+9$
Work Step by Step
From Page 302, we know that the square of a binomial difference $x-y$ is given by the following equation:
$(x-y)^{2}=x^{2}-2xy+y^{2}$
Therefore, $(a-3)^{2}=a^{2}-2(a)(3)+3^{2}=a^{2}-6a+9$.
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