Simplify:
$(x^{2} + 3) (x - 3) + 9$

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Solution

$(x^{2} + 3) (x - 3) + 9$
= $x^{2} (x - 3) + 3 (x - 3) + 9$
= $x^{2} - 3 x^{2} + 3 x - 9 + 9$
= $x^{3} - 3 x^{2} + 3 x$

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