Now you know that is one factor so is one root.
Use that to find the other roots.
f(x) = x^3 + ax^2 + bx + 10
is divisible by (x+2) but leaves a remainder of 12 when divided by (x+1)
a) Find the values of a and b
b) solve the equation f(x) = 0
i have done a) (i think) and come up with a = 4 b = -7 (is that right)
and im completely stumped on b)
any help is appericated