Logarithms

(the inverse of exponents)

log= common log (log10)

ln= natural log (loge)

the difference between common log and natural log is the base

use logarithms to get x out of the exponent, 5^x = 12

KEY TO EVERYTHING

ex: log101000=3 <---> 10^3=1000

log216=x ---> 2^x=16 ---> x=4

log5125 ---> 5^x=125 ---> x=3

log3(1\18) ---> 3^x=(1\18) ---> x=-4

log42=x ---> 4^x=2 ---> x=(1\2)