`4^x = 16` Solve for `x`.
Get the base to be the same
Another method to solve this problem is to use logarithms (either log or ln, I prefer the latter). Use the ln and then use it's properties to solve for x.
Make sure you do the same thing on both sides!
Divide both sides by `ln4 `
Note that you should get the same answer if you used the other method. If you don't then recheck your work because you must have made a mistake along the way!