x^4+9x^2-400

Find the zeros  
I factored got (x^2+25)(x-4)(x+4) one zero is 4 but I can't find the rest.
I'd appreciate your help! Thanks
-Alex
in Algebra 2 Answers by

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1 Answer

x^4 +9x^2 -400=0

thank av x^2 =y

& yu hav y^2 +9y-400=0

yuze quadratik equashun tu get y=16 or -25

so x^2=16 or -25

x=4, -4, 5i, -5i
by

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