Math Help - log function....

1. log function....

how would i get x? the previous method does not work.....

3. Originally Posted by pickslides
well i meant in its simplest form...

4. It doesn't get much more simple

$x = 2^{\log_23+\log_28}$

$x = 2^{\log_23+\log_22^3}$

$x = 2^{\log_23+3\log_22}$

$x = 2^{\log_23+3\times 1}$

$x = 2^{\log_23+3}$

$x = 2^3\times 2^{\log_23}$

$x = 8\times 2^{\log_23}$

5. i'm supposed to be getting a whole number i think

6. Well it's nearly there. What's $2^{\log_2 x}$ for any $x$?

7. Originally Posted by Matt Westwood
Well it's nearly there. What's $2^{\log_2 x}$ for any $x$?
honestly i'm not too sure, my guess would be 1?

8. Hello, frozenflames!

Simplify: . $x \:=\:2^{\log_23 + \log_28}$

We have: . $x \;=\;2^{\log_23+\log_28} \;=\; 2^{\log_2(3\cdot8)} \;=\;2^{\log_2(24)} \;=\;24$

9. Originally Posted by frozenflames
honestly i'm not too sure, my guess would be 1?
This is the most fundamental truth about exponentials and logarithms that you really need to understand: one is the inverse of the other. That is, logarithms "undo" exponents, and exponents "undo" logarithms.

$a = \log_b c \iff c = b^a$ for any $a$, and any $b, c$ positive. That's how logarithms are defined.

So $2^{\log_2 x} = \log_2 (2^x) = x$.