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Posted by **ALLI** on Wednesday, September 5, 2012 at 10:35pm.

h(x)=x^4-15x^3+60x^2+70x-816

zero: 5

show work

- algebra -
**Reiny**, Wednesday, September 5, 2012 at 10:51pmif 5 is a zero, then x-5 is a factor

So use either synthetic or long algebraic division to show that

x^4-15x^3+60x^2+70x-816 = (x-5)(....)

Hey, I just tried that and 5 is not a zero of your function, that is, x-5 does not divide evenly.

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to your reply, please check again - that should of said Zero: 5 - 3 i for the ...