santaclaus wrote:...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:

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

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

. . . . .. . . . .(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.

. . . . .. . . . .. . . . .. . . . .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!