# How to express this exponential equation in terms of $m$?

How can I express the equation

$c = 2^{m+1} - 2^m$

in terms of m? t.i.a.

-
It already seems to be expressed in terms of $m$. Please clarify what you want. –  Henning Makholm Sep 14 '11 at 22:11

What do you means by write in term of $m$? Do you means simplify? Do you mean any of the following?
$c = 2^{m}(2 - 1) = 2^{m}(1) = 2^m$
or $m = log_2 c$.
I'd be surprised if OP meant anything other than "solve for $m$ in terms of $c$," and in that context this qualifies as an answer. –  Gerry Myerson Sep 14 '11 at 22:28