4.2 Logarithms.

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Presentation transcript:

4.2 Logarithms

b must always be greater than 0 y is the exponent X is the argument b is the base b CANNOT = 1 b must always be greater than 0 y is the exponent can be all real numbers X is the argument must be > 0 “logbx is the exponent to which the base b must be raised to give you x.”

Write in the other form: 32 = 9 log 6216 = 3

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Graph: y = log2x

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y = -log2x y = log2(-x)

Common Logarithms – base 10 logx = log10x Natural Logarithms – base e lnx = logex y = lnx is the inverse of y = ex

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Homework pg 349 #3-37 odd, 41-46 all