Work Step by Step
The leading coefficient of the given trinomial is 1. Thus, it can be factored by looking for the factors of the constant term ($20$) whose sum is equal to the numerical coefficient of the middle term ($-9$). Note that $20=-5(-4)$ and $-5+(-4)=-9$. Thus, the given trinomial can be factored as $(x-5)(x-4)$. Therefore the term of the second factor is $-4$.