That is, if I'm going about it right. Trying to help my kid with math and totally stumped. Original problem is like this:
f(x) = 0.5x
A * f(x) = f(x + A)
Solve for A.
I played around for a while and kept coming back to
(log A) / A = log 0.5
But I don't know where to go from there. The answer is given, but I couldn't figure out how to get there. Help!