Please, please, post only ONE question at a time. The way Brainly is set up, it's very difficult to conclude one problem and then move on to the next in the same session.
Solve y = log3243. I must make the assumption here that you mean:
Solve y = (log to the base 3) of 243.
Solve y = (log 243 in better, more compact form.
3
If you recognize that 243 is an integer power of 3, the problem becomes much easier.
2 3 4 5
Note that 3 = 9, 3 = 27, 3 =81, and 3 = 243.
Also note that the log function and the exponential function are inverses of one another, and that inverse functions "undo" each other.
x
Thus, log 3 is simply x.
3
5
Thus, log 243 = log 3 = 5 (answer).
3 3
Please repost the rest of your questions, one at a time, and then I will gladly help you with them.
