If $f : R \rightarrow R$ is defined by $f(x)=x^2-3x+2$, write $f(f(x))$.

Question

$\begin{array}{1 1} x^4 -6x^3 -10x^2 -3x \\ x^4 -6x^3+10x^2 -3x \\ x^4+6x^3 -10x^2 +3x \\ x^4 +6x^3 +10x^2 +3x \end{array}$