Table of contents

0. Review of Algebra4h 18m
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 22m
10. Combinatorics & Probability1h 45m

6. Exponential & Logarithmic Functions

Solving Exponential and Logarithmic Equations

College Algebra

6. Exponential & Logarithmic Functions

Solving Exponential and Logarithmic Equations

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2:11 minutes

Problem 92

Textbook Question

n 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 = 73(2.6)^x

Verified step by step guidance

Rewrite the given equation y = 73(2.6)^x in terms of base e. To do this, recall that any exponential expression a^x can be rewritten as e^(x * ln(a)), where ln(a) is the natural logarithm of a.

Apply the property to rewrite (2.6)^x as e^(x * ln(2.6)). The equation now becomes y = 73 * e^(x * ln(2.6)).

To isolate x, divide both sides of the equation by 73, resulting in y / 73 = e^(x * ln(2.6)).

Take the natural logarithm (ln) of both sides to eliminate the exponential. This gives ln(y / 73) = x * ln(2.6).

Solve for x by dividing both sides of the equation by ln(2.6). The final expression is x = ln(y / 73) / ln(2.6).

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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 = 73(2.6)^x represents an exponential growth model, where the output increases rapidly as 'x' increases. Understanding the properties of exponential functions is crucial for rewriting them in different bases.

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 the inverse operation of the exponential function with base 'e'. When rewriting an exponential equation in terms of base 'e', the natural logarithm is used to express the exponent in a more manageable form, facilitating easier calculations and interpretations.

Change of Base Formula

The change of base formula allows us to convert logarithms from one base to another. It states that log_b(a) = log_k(a) / log_k(b) for any positive 'k'. This concept is essential when rewriting the given exponential equation in terms of base 'e', as it enables the transformation of the base from 2.6 to 'e', allowing for the use of natural logarithms in the solution.