# power notation

• Nov 2nd 2009, 06:56 PM
realistic
power notation
write in power notation
i get the first one but stuck on second

1.)
log 5 625 =4
= 5^4 =625

2.)
log100000 =5
=?
• Nov 2nd 2009, 06:59 PM
VonNemo19
Quote:

Originally Posted by realistic
write in power notation
i get the first one but stuck on second

1.)
log 5 625 =4
= 5^4 =625

2.)
log100000 =5
=?

Look at all those zeros. And since the base is not given, I wonder what that means? Hint hint. (Wink)
• Nov 2nd 2009, 06:59 PM
Prove It
Quote:

Originally Posted by realistic
write in power notation
i get the first one but stuck on second

1.)
log 5 625 =4
= 5^4 =625

2.)
log100000 =5
=?

What's the base of the logarithm in Q2?
• Nov 2nd 2009, 07:01 PM
jmedsy
since log x, unless otherwise specified, has a base of 10, then for log 100000=5, power notation is 10^5 = 100000
• Nov 2nd 2009, 07:02 PM
realistic
Quote:

Originally Posted by jmedsy
since log x, unless otherwise specified, has a base of 10, then for log 100000=4, power notation is 10^5 = 100000

log100000 =4?

ok i c so if the base is not specified you assume it has a base of 10?

10^5 makes sense thanks
• Nov 2nd 2009, 07:05 PM
jmedsy
sorry i meant to type log 100000 = 5 there. yep