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