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4.4 Exponential and Logarithmic Equations.notebook November 10, 2016
4.4: Exponential and Logarithmic Equations Date: 11/10
An Exponential Equation is an equation containing a variable in an exponent
Examples:
*Some exponential equations can be solved by expressing each side of the equation
as a power of the same base
*All exponential functions are one‐to‐one ‐ no two different ordered pairs have the
same second component. So, if and
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4.4 Exponential and Logarithmic Equations.notebook November 10, 2016
Ex 1: Solve each equation by expressing each side as a power of the same base:
a) b)
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4.4 Exponential and Logarithmic Equations.notebook November 10, 2016
*Most exponential equations cannot be written so that each side has the same
base.
Using Logarithms to Solve Exponential Equations:
Step 1: Isolate the exponential expression.
Step 2: Take the natural logarithm of both sides of the equation for bases other
than 10. Take the common logarithm on both sides for base 10.
Step 3: Simplify using one of the following properties:
Step 4: Solve for the variable.
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4.4 Exponential and Logarithmic Equations.notebook November 10, 2016
Ex 2: Solve:
a) b)
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