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: x4-2x+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 x4
- 16 = (x2
+ 4) and 2x2
- 8 = 2(x2
If you get stuck, please reply showing your steps. Thank you!