Thread: its me again -.- help with another exponential question? :D

Solve the following equation:





Answer:

I don't know what to do with the 15!!!
Help me? Pretty pleaseeee?

Thank you very much!!

Hey pumbaa213.

Apart from trial and error, you will probably have to use a root finding algorithm. Have you come across this in class?

Originally Posted by ibdutt

Do you solve the last part with logarithms or have they not been taught when solving these? I just want to make sure I am not using anything that is ''not allowed''.

You don't need logarithms. It should be obvious that if then x= 1. (You do need to know that , for a positive, is a "one-to-one function" to know that x= 1 is the only solution.

Originally Posted by HallsofIvy

You don't need logarithms. It should be obvious that if then x= 1. (You do need to know that , for a positive, is a "one-to-one function" to know that x= 1 is the only solution.

Okay, so we don't need logarithm until the answer becomes more complicated..Like x=2/3 or something. Right?

X is not equal to 1
2^4 is not equal to 0+15
If X = 0.9999 you get a close equality