How can I factor x^4-10x^2+9 ?

I am having some trouble with my math homework and this question has given me a lot of trouble. I need to find a way how to factor x^4-10x^2+9 to its simplest form. Please help!

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1 Answer

x^4 -10x^2 +9=0

set y=x^2, & yu hav y^2-10y +9=0

yuze quadratik equashun

yu get (y-9)(y-1)=0

or y=1 & y=9

x=sq root(y)...1, -1, or 3 or -3
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