Posted by **david** on Monday, October 31, 2011 at 1:35pm.

use the given zero to find the remaining zeros of each function.g(x)=x^3+3x^2+25x+75;zero:-5i

- college algebra -
**Steve**, Monday, October 31, 2011 at 2:16pm
If -5i is a zero, then so is +5i

So, we know that g(x) = (x^2+25)(x+a)

= x^3 + 25x + ax^2 + 25a

Looks like a=3

So, the remaining zero is x=-3

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