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April 26, 2015

Homework Help: Pre Calc

Posted by Zach on Sunday, November 15, 2009 at 9:30pm.

Write a quartic function that has roots that are 3+5i, -4 and 7 and
f(-3)=53.

I have tried it a bunch of times and can't seem to get it.

(x-3+5i)(x-3-5i)(x+4)(x-7)
I multiplied them together
x^4-9x^3+24x^2+66x-952
I was a little unsure what f(-3)=53 means.

I thought I should plug -3 in for x and it should equal 53. That doesn't work.

Can you please help me see where I went wrong?

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