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Solving equation X 4-2x in high school mathematics? =0 online waiting ~ ~
x^4-2x^2 = x^2 *(x^2-2)= x^2 *(x+sqrt(2))*(x-sqrt(2))= 0

So x has three solutions:

x 1 = 0； x2 = sqrt(2)； x3 =-sqrt(2)；

Where sqrt(2) stands for root number 2.

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