I found this for the answer. I hope that I helped.
Simplifying
F(n) = f(n + -1) + 1
Multiply F * n
nF = f(n + -1) + 1
Reorder the terms:
nF = f(-1 + n) + 1
nF = (-1 * f + n * f) + 1
nF = (-1f + fn) + 1
Reorder the terms:
nF = 1 + -1f + fn
Solving
nF = 1 + -1f + fn
Solving for variable 'n'.
Move all terms containing n to the left, all other terms to the right.
Add '-1fn' to each side of the equation.
-1fn + nF = 1 + -1f + fn + -1fn
Combine like terms: fn + -1fn = 0
-1fn + nF = 1 + -1f + 0
-1fn + nF = 1 + -1f
Reorder the terms:
-1 + f + -1fn + nF = 1 + -1f + -1 + f
Reorder the terms:
-1 + f + -1fn + nF = 1 + -1 + -1f + f
Combine like terms: 1 + -1 = 0
-1 + f + -1fn + nF = 0 + -1f + f
-1 + f + -1fn + nF = -1f + f
Combine like terms: -1f + f = 0
-1 + f + -1fn + nF = 0
The solution to this equation could not be determined.
