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Posted by **CheezyReezy** on Wednesday, June 1, 2011 at 8:57pm.

f(x) = x^4 - 91x^2 - 900

Hi, I need help... I'm not understanding this complex zero..

- Math -
**Mgraph**, Wednesday, June 1, 2011 at 9:58pmSubstitute: x^2=z => x^4=z^2

z^2-91z-900=0

(z-100)(z+9)=0

If z=100, x^2=100 then x=10 or x=-10

If z=-9, x^2=-9=9i^2 then x=3i or x=-3i

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