We will need to use synthetic division to factor the first part
Repeat
This is the solution to part a
These are the factors in the form (x-c)
Now to find the solution set each of the factors equal to zero
x+3 =0 x+3 = 0 x- sqrt(11) =0 x+ sqrt(11) =0
The solutions are
-3, sqrt(11), - sqrt(11)