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posted by Mary on Sunday, April 24, 2011 at 1:04pm.

Solve. 25x^4-15x^2+2=0

Substitute u = x^2, and solve 25u^2 -15u +2 = 0 (5u -1)(5u-2) = 0 u = 1/5 or 2/5 x = sqrt u Take it from there.

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