## Algebra 1

$(g-15)(g-3)$
The first term in the expression is $g^{2}$, so we know that there will be a $g$ in each set of parentheses. Next, you must figure out what two numbers multiply together to get $45$ (the third term), but also add up to -$18$ (the second term). The two numbers that fit into these parameters are -$15$ and -$3$. Therefore, one set of parentheses will contain $g-15$ and the other set of parentheses will contain $g-3$. So, the final answer is $(g-15)(g-3)$.