College Mathematics

[DixieGirl]

Aggh, I'm so fuzzy on this. This is a problem from the CLEP practice test. I'm putting parenthesis around things that are exponents, since there's no way to denote them:


If 8(x) = 15 and 8(y) = 25, then 8(2x +y) = ??????

I can't for the life of me remember how to work this problem and digging through my old math books shed no light. Any ideas?

Did you mean
8^x = 15
8^y = 25
8^(2x+y) = ??

I couldn't figure it out either, but I posted this on another forum and they said,

"since 8x = 15 ... 82x = (8x)2 = 152.

82x+y = 82x*8y = 152*25"

Hope this helps!:o