Math

Find all complex zeros for the following polynomial function. Please show all of your work.

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

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

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  1. Substitute: 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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