Hi,

x^4-3x^2+2

Find all zeros

(x^2-3/2)^2 - 9/4 + 2 = 0

 (x^2-3/2)^2 = 5/4

 x^2-3/2 = ± sqrt(5)/2

 x^2 = (3/2 ± sqrt(5)/2)

   x = ± (3/2 ± sqrt(5)/2)

   x = 3/2 + sqrt(5)/2

   x = 3/2 - sqrt(5)/2

   x = -3/2 + sqrt(5)/2

   x = -3/2 - sqrt(5)/2 

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