Log Question

[2254178]

Hello!

I am currently using the College Algebra Clep test, and I was working on the section about logarithms when I came upon a problem. The equation was "log2(5.4)" (Base 2)

This was question 24. I didn't know how to do this, so I read the answer. It told me that logaX = logbX * logba (It's base a, then base b). When I tried to redo the equation the way they said, I kept getting the answer 0.22047249034.

I looked it up on the internet, and I found another way to do it that works, but I don't understand what I'm doing wrong. If someone could clue me in I'd be much obliged.

Thanks!