http://i49.tinypic.com/28guur5.jpg

I'm so confused on these two problems. If you could help at all I would really appreciate it. Thanks!

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- December 13th 2009, 12:00 PMlucyluuTwo problems- one with square root, one with powers.
http://i49.tinypic.com/28guur5.jpg

I'm so confused on these two problems. If you could help at all I would really appreciate it. Thanks! - December 13th 2009, 12:19 PMRaoh
- December 13th 2009, 12:20 PMpickslides
Hi there, in the first question, are they addition signs or division signs underneath the square root?

In the second quesiton use some logs.

- December 13th 2009, 12:22 PMRaoh
- December 13th 2009, 12:37 PMlucyluu
- December 13th 2009, 12:45 PMDefunkt
- December 13th 2009, 12:51 PMpickslides
You can find some estimates by trial and error.

Consider

We know that and as 15 is between 8 and 16 then x must be between 3 and 4, probably closer to 4.

It now depends on how accuarate you want to be.

Do the same for , the answer should be between 1 and 2. - December 13th 2009, 12:54 PMRaoh
it seems that he only wanted the value of which is (as "Defunkt" showed).

- December 13th 2009, 01:04 PMBacterius

Since ,

So, .

--------------------------

, so

, so

Thus .

Now, you know from the change of base formula that :

So,

:)