Solve for x : 3^x = 243

We  notice that 243 can be written as a power of 3. We'll
write 243 = 3^5, to create matcing bases both sides of the
equation.

3^x = 3^5

Since the
bases of exponentials are matching, we'll apply the one to one property of
exponential.

x =
5

The solution of the equation is x =
5.