6.6 Solving Exponential and Logarithmic Equations
[Pages:6]6.6 Solving Exponential and Logarithmic Equations Exponential Equations: Equations in which the variable expression occurs as exponents
Example 1: Solving Exponential Equations Solve each equation
a)
100# =
% #'( %&
b) 2# = 7
Example 2: Solving a Real-Life Problem You are cooking a stew. When you take the stew off the stove its temperature is 212oF. The room temperature is 70oF, and the cooling rate of the stew is + = 0.046. How long will it take to cool the stew to a serving temperature of 100oF?
Logarithmic Equation: Are equations that involve logarithms of variable expressions.
Example 3: Solving Logarithmic Equations Solve the following equations
a) ln 41 - 7 = ln 1 + 5
b) log7 51 - 17 = 3
Example 4: Solving a Logarithmic Equation Solve log 21 + log(1 - 5) = 2
Try on your own: Solve the equation. Check for extraneous solutions
Example 5: Solve an Exponential Inequality Solve: 3# < 20 Example 6: Solving a Logarithmic Inequality Solve: log 1 2 Try on your own:
Homework: 5, 7, 11, 14, 17, 18, 20, 21-31odd, 33, 34, 38, 47-53odd, 63,
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