Answer
$4p^{2}-9$
Work Step by Step
From Page 301, we know that the product of a sum and difference of two terms $x$ and $y$ is given by the following equation: $(x+y)(x-y)=x^{2}-y^{2}$.
Therefore, $(2p-3)(2p+3)=(2p)^{2}-3^{2}=2^{2}p^{2}-9=4p^{2}-9$.