Answer
$(r-5)(r-7)$
Work Step by Step
The first term in each binomial must be r, since $r^2$ has no coefficient.
The operation in each binomial must be subtraction, since the trinomial has a positive and a negative term.
$-5+(-7)=-12$ and $-5\times(-7)=35$, so the other two terms are -5 and -7.
