...when I looked at the help area you told me to go to, I saw that you had to square both sides and then solve the equation: so, i tried: x^{4}-2x+x=16-4x+x

Your original equation was:

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Squaring the left-hand side gives:

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. . . . .
Squaring the right-hand side gives:

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. . . . .
(To learn how to multiply polyomials and polynomial-like expressions, try

**here**. To learn how to work with radicals, try

**here**.

To solve the resulting equation, you'll need to isolate the radicals on one side, and then square again.

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Note that x

^{4} - 16 = (x

^{2} - 4)(x

^{2} + 4) and 2x

^{2} - 8 = 2(x

^{2} - 4)....

If you get stuck, please reply showing your steps. Thank you!