(2x^3-10x^2+x-5)/(x-5)
(2x^3-10x^2+x-5)/(x-5) factor the numerator by grouping
[(2x^2)(x - 5) + 1(x -5)] / (x - 5) =
[ (2x^2 + 1) (x - 5) ] / (x - 5) = "cancel" the (x - 5) in numerator and denominator
2x^2 + 1
It can be written like this:
(2 x^3-10 x^2+x-5)/(x-5)
x = i/sqrt(2) and x = -i/sqrt(2)
