algebra
posted by Anonymous on .
factor f(x)=4x^(3)+19x^(2)149x+36 into linear factors if f(x)=9

after a few tries I found f(4) = 0
so (x4) is a factor
by synthetic long division I got
(x4)(4x^2 + 35x  9)
= (x4)(x+9)(4x  1)
What does the fact that
f(x) = 9 have to do with it.?
Did you mean to say: f(9) = 0 , that would have given me the clue that x+9 is a factor.