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posted by john Tuesday, December 1, 2009 at 11:48pm.

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

first factor to (2x^2 - 1)(5x^2 - 2) = 0 x^2 = 1/2 or x^2 = 2/5 x = ±1/√2 or x = ±√2/√5 your text answer might have these rationalized.

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