Homework Help: Math, Pre Calc

Posted by Nikki on Wednesday, September 5, 2012 at 3:21pm.

Given that (+-2) and i are the roots of a 4th degree polynomical, find the equation.

Please help! Thank you:)

Math, Pre Calc - Steve, Wednesday, September 5, 2012 at 3:39pm
complex roots come in pair, so -i is also a root

f(x) = (x-2)(x+2)(x-i)x+i)
= (x^2-4)(x^2+1)
= x^4 - 3x^2 - 4
Math, Pre Calc - Alexis, Wednesday, September 5, 2012 at 4:15pm
Thanks!

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