# Form a polynomial help

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• October 19th 2009, 04:50 PM
relichunter09
Form a polynomial help
Hey guys , Need help with this one -( Form a polynomial whose zeros and degrees are given. Zeros; -1 , 1 , -7 degree 3 )

Thanks
• October 19th 2009, 05:31 PM
I-Think
Any polynomial with 3 roots has a degree 3
So, you have the roots at x=1, x=-1 and x=-7
Carry over so that you have
(x-1), (x+1) and (x+7), these are the 3 factors of your desired polynomial so just multiply them to get your answer.

$(x-1)(x+1)(x+7)$
$(x^2-1)(x+7)$
$x^3+7x^2-x-7$
• October 20th 2009, 12:50 PM
relichunter09
Thanks(Rofl)