Question 592458
<img src="http://latex.codecogs.com/gif.latex?\log_{2}\left( \frac{1}{2} \right )" title="exp" />


<img src="http://latex.codecogs.com/gif.latex? \frac{\log_{10}\left( \frac{1}{2} \right )}{\log_{10}\left( 2 \right )}" title="exp" />


<img src="http://latex.codecogs.com/gif.latex? \frac{\log_{10}\left( 2^{-1} \right )}{\log_{10}\left( 2 \right )}" title="exp" />


<img src="http://latex.codecogs.com/gif.latex? \frac{-1*\log_{10}\left( 2 \right )}{\log_{10}\left( 2 \right )}" title="exp" />


<img src="http://latex.codecogs.com/gif.latex? -1" title="exp" />


So <img src="http://latex.codecogs.com/gif.latex?\log_{2}\left( \frac{1}{2} \right ) = -1" title="exp" />