Simplify: 3x(x - 6) + x² + 6x - 9 + 24

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Simplify: 3x(x - 6) + x² + 6x - 9 + 24 - x³

A15-12x + 4x² + x³

B15+12x + 4x² - x³

C15-12x + 4x² - x³

D15+12x + 4x² + x³

Answer:

$3x^2-18x+x^2+6x-9+24-x^3$

$15-12x+4x^2-x^3$

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