Finding the roots in complex equations.

Find all the zeros (both real and complex) of

f(x)= x^5 - 3x^4 + 12x^3 - 28x^2 + 27x -9

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...efore I can divide x^5-3x^4+12x^3-28x^2+27x-9 by x-1.
I get x^4-2x^3+10x^2-18x+9.

Therefore f(x)=(x-1)(x^4-2x^3+10x^2-18x+9) and I need ...