Answer
$A^{2}+2AB+B^{2}$, squared, product of the terms, squared
Work Step by Step
$(A+B)^{2}=A^{2}+2AB+B^{2}$. The square of a binomial sum is the first term squared plus 2 times the product of the terms plus the last term squared.
This concept is further explained on page 56.
