We can factor out $x^2$ to get $x^2(9x^2 - 12x + 4)$. The quadratic $9x^2 - 12x + 4$ can be factored further into $(3x - 2)^2$.
So, the original function $f(x)$ can be rewritten as $f(x) = 4x^4 \cdot x^2 \cdot (3x - 2)^2 = 4x^6 \cdot (3x - 2)^2$.
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