Skowhegan Area High School
 Topics Introduction Inverses Horizontal Line Test Restricting Domain Composition Functions Common Logs Exponential to Log. Form Rules of Logarithms Logarithmic Scales
 . *Adding: When adding two logarithms together you simply multiply the vaule you’re trying to find the answer to, and then take the logarithm of that number. example: log3 + log9 = log 27 log17 + log2 =log34 * Subtracting: When subtracting two logarithms you need to divide them. Find the logarithm of the two numbers you’re trying to find the answer to by dividing the first number by the second number, and then take the logarithm of that. example: log(3) - log(9) = log(3/9) log(17) - log(2) = log(17/2) * Powers: When trying to find the logarithm of a value that’s raised to an exponent, then you drop the exponent to the beginning of the equation, and then multiply the logarithm of the value, by the exponent. example: = 4log3 = 2log2 * Bases: When the base number, and the value you’re trying to find the function of are the same number, then the answer is always going to be 1. example: