Answer
$y^2-13y+36$
Work Step by Step
RECALL
For any real numbers a, b, and c:
$a(b-c)=ab - ac$
Use the distributive property (which is shown above) to obtain:
$=y(y-9) - 4(y-9)
\\=y(y) - y(9) - 4(y) - 4(-9)
\\=y^2-9y-4y-(-36)
\\=y^2-13y+36$
