2010 · Q87
If (x4 + x-4) = 322, what is one of the values of (x-x-1 )?
Elementary MathematicsAlgebra
- A18
- B16
- C8
- D4
Explanation
(x²+x⁻²)=18, so (x-x⁻¹)²=16; one value is 4.
If (x4 + x-4) = 322, what is one of the values of (x-x-1 )?
Explanation
(x²+x⁻²)=18, so (x-x⁻¹)²=16; one value is 4.