GWL April 28, 2010
Exponent Laws ( Logarithm Laws )
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Identity of
Identity of
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So,
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As you had to memorize other formulae, such as quadratic formula,
midpoint formula, slope formula, etc., you also must memorize the
Change of base formula:
Here the subscript a is either 10 or e (log base 10 or the ln base e)
Change of base is used to convert other bases to base 10 or base e so you
can use the log functions on the calculator (which are only
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