Answer
$(c-3)(c-6)$
Work Step by Step
The first term in each binomial must be c, since $c^2$ has no coefficient.
The operation in each binomial must be subtraction, since the trinomial has a positive and a negative term.
$-3+(-6)=-9$ and $-3\times(-6)=18$, so the other two terms are -3 and -6.
Since the two binomials contain the same expression they are written with an exponent of 2,
