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Originally Posted by studyhard
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?
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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!
