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- Sky - VhinLv 67 years agoFavorite Answer
3x(x-1)(5x+9)
= 3x(5x² + 9x – 5x -9)
= 3x (5x² - 4x – 9)
= 15x³ - 12x² - 27x
- ?Lv 57 years ago
just remember what foil means.
forget about the 3x for now.
(x - 1) (5x + 9)
x * 5x + x * 9 + (-1)(5x) + (-1)(9)
5x^2 + 9x - 5x - 9 = 5x^2 + 4x - 9
and that is multiplied by 3x
3x(5x^2 + 4x - 9)
this just multiplies everything by 3 and adds a power of x so:
15x^3 + 12x^2 - 27x
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