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cairolove228
29.09.2019 •
Mathematics
Hi guys. i’m not sure how to answer this so i was wondering if you guys could me.
question: what are the roots of the following polynomial x cubed - 9x?
how would i do this correctly? do a step by step answer.
!
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Ответ:
x = 0, x = ± 3
Step-by-step explanation:
To find the roots equate the polynomial to zero, that is solve
x³ - 9x = 0 ← factor out x from both terms
x(x² - 9) = 0 ← factor difference of squares
x(x - 3)(x + 3) = 0
equate each factor to zero and solve for x
x = 0
x - 3 = 0 ⇒ x = 3
x + 3 = 0 ⇒ x = - 3
roots are x = 0, x = ± 3
Ответ:
Step-by-step explanation:
There must be an attachment. I have no knowledge of what to solve for, unless you can tell or show me the missing pieces.