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February 28, 2015

February 28, 2015

Posted by **ash** on Monday, August 27, 2012 at 12:50am.

degree 4 zeros i, -18+i

enter the remaining zeros of f

please help me out!

- algebra college -
**Reiny**, Monday, August 27, 2012 at 8:17amcomplex roots always come in conjugate pairs,

so the roots are ħi and -18+i and -18-i

so you would have

(x+i)(x-i)(x+ 18-i)(x+18+i)=0

(x^2 + 1)(x^2 + 18x + xi + 18x + 324 + 18i - xi - 18i - i^2) = 0

(x^2 + 1)(x^2 + 36x +324 + 1) = 0

(x^2 + 1)(x^2 + 36x + 325) = 0

expand again, and simplify

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