Ch. 7 - Transcendental Functions

Hass15th EditionThomas' CalculusISBN: 9780137616077Non è quello che usi tu?Cambia libro di testo

Hass 15th Edition

Ch. 7 - Transcendental Functions

Problema 7.2.6

Capitolo 7, Problema 7.2.6

In Exercises 5 and 6, solve for t.
6. ln(t-2) = ln8 - ln(t)

Guida verificata passo dopo passo

Start with the given equation: \(\ln(t - 2) = \ln 8 - \ln t\).

Use the logarithm property that \(\ln a - \ln b = \ln \left( \frac{a}{b} \right)\) to combine the right side: \(\ln(t - 2) = \ln \left( \frac{8}{t} \right)\).

Since the natural logarithm function \(\ln x\) is one-to-one, set the arguments equal to each other: \(t - 2 = \frac{8}{t}\).

Multiply both sides of the equation by \(t\) to eliminate the denominator: \(t(t - 2) = 8\).

Expand and rearrange the equation into standard quadratic form: \(t^2 - 2t - 8 = 0\). Then solve this quadratic equation for \(t\).

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Properties of Logarithms

Logarithmic properties, such as the difference rule ln(a) - ln(b) = ln(a/b), allow us to combine or separate logarithmic expressions. These properties are essential for simplifying equations involving logarithms and solving for variables inside the log functions.

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Change of Base Property

Solving Logarithmic Equations

To solve logarithmic equations, we often rewrite the equation using log properties to isolate the logarithm on one side, then exponentiate both sides to eliminate the logarithm. This transforms the equation into an algebraic form that can be solved for the variable.

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Solving Logarithmic Equations

Domain Restrictions of Logarithmic Functions

The argument of a logarithm must be positive, so when solving equations like ln(t-2) = ln8 - ln(t), we must ensure t-2 > 0 and t > 0. These domain restrictions are crucial to identify valid solutions and exclude extraneous ones.

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Graphs of Logarithmic Functions

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