\
The logarithm equation is
.
\
\
Apply definition of logarithm :
if and only if
.
\
\
.
\
\
The value of
is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a0b7c0d474d2011a83bd4c41a1eb61ef.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=aaa9b0cdda3f2b60f1276996969f0047.png\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5d94ecedf956bed2c4e149e2ad8d0028.png\")
if and only if ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5e6c4d43d41ddd43bc5a4df41d00c233.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ce1662efeab68463b5efa2bf88111cd9.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=189bbc5cb47347ec5978d62616685e4a.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d43282340bb8b644685b55e3c6fb264.png\")
is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b8c4f85d0e96361e17c371463221b9b8.png\")
.