9000019810

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9000019810

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5 x^{4} - 30 x^{2} + 40 = 0

5 (x - \sqrt{2}) (x + \sqrt{2}) (x - 2) (x + 2) = 0

(x - \sqrt{2}) (x + \sqrt{2}) (x - 2) (x + 2) = 0

5 x (x - \sqrt{2}) (x + \sqrt{2}) (x - 2) = 0

5 x (x - \sqrt{2}) (x + \sqrt{2}) (x + 2) = 0

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