Table of contents
- 0. Review of Algebra4h 16m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 6m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 19m
- 10. Combinatorics & Probability1h 45m
6. Exponential & Logarithmic Functions
Solving Exponential and Logarithmic Equations
2:19 minutes
Problem 93c
Textbook Question
Textbook Questionn Exercises 92–93, rewrite the equation in terms of base e. Express the answer in terms of a natural logarithm and then round to three decimal places. y = 6.5(0.43)^x
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Exponential Functions
Exponential functions are mathematical expressions in the form y = a(b^x), where 'a' is a constant, 'b' is the base, and 'x' is the exponent. In this context, the function y = 6.5(0.43)^x represents an exponential decay since the base (0.43) is less than 1. Understanding the behavior of exponential functions is crucial for rewriting the equation in terms of natural logarithms.
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Exponential Functions
Natural Logarithm
The natural logarithm, denoted as ln(x), is the logarithm to the base 'e', where 'e' is approximately equal to 2.71828. It is used to solve equations involving exponential functions by transforming them into linear forms. In this problem, converting the given exponential equation into a natural logarithm will allow us to isolate the variable 'x' and express the equation in a more manageable form.
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Logarithmic Properties
Logarithmic properties are rules that govern the manipulation of logarithms, such as the product, quotient, and power rules. These properties are essential for simplifying expressions and solving equations involving logarithms. In this case, applying the power rule will help in rewriting the equation y = 6.5(0.43)^x in terms of natural logarithms, facilitating the solution process.
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