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9x^4 -18x^2 + 5=0

Let y be x^2 9y^2-18y+5=0

(3y-5)(3y-1)=0

3y-5=0 or 3y-1=0

3x^2-5=0 3x^2-1=0

x^2=±√5/3 x=±1/√3

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