Elementary Algebra

$(y+12)(y-1)$
The leading coefficient of the given trinomial is 1. This means that it can be factored by looking for factors of the constant term (-12) whose sum is equal to the numerical coefficient of the middle term (11). Note that $-12=(12)(-1)$ and that $12 + (-1) = 11$, the numerical coefficient of the middle term. The factors of $-12$ whose sum is $11$ are $12$ and $-1$. Therefore the factored form of the given trinomial is: $=(y+12)(y-1)$