Multiply and simplify. (x - 3)(x2 + 3x + 9) A) x3 - 27 B) x3 - 27x2 C) x3 - 6x2 + 3x - 27 D) x3 - 9x2 + 6x - 27

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09-04-2018
Mathematics

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Multiply and simplify. (x - 3)(x2 + 3x + 9) A) x3 - 27 B) x3 - 27x2 C) x3 - 6x2 + 3x - 27 D) x3 - 9x2 + 6x - 27

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carlosego carlosego · Answer 1 · 2018-04-18T15:08:52+02:00

carlosego carlosego

18-04-2018

We have the following expression:
(x - 3) (x2 + 3x + 9)
Rewriting we have:
(x3 + 3x2 + 9x) + (-3x2 - 9x - 27)
Adding similar terms we have:
x3 + x2 (3-3) + x (9-9) - 27
x3 - 27
Answer:
The simplified expression is:
A) x3 - 27

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