x^3+2x-x-2=0
Substitute
with 1:
1+2-1-2=0
Then 1 is one of the function's
roots.
Then (x-1) is one of the factors.
Now divide the
function by (x-1).
x^3+2x-x-2=0
(x-1)(x^2+3x+2)=0
Factorize:
(x-1)(x+1)(x+2)=0
Then the roots are:
x1=1
x2=-1
x3=-2
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