A sequence $x_1, x_2, x_3, \dots$ is defined by $x_n = x_{n - 1} - x_{n - 2}$ for all $n \ge 2$.
If $x_{10} = -5$ and $x_{14} = 8$, then determine $x_1$.
+2668 Wait... so x1=x0−x-1, but the function isn't defined for n>2.
The problem doesn't make sense.....
