Skip to main content
Ch. 4 - Exponential and Logarithmic Functions
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo
Capitolo 5, Problema 65

Use properties of logarithms to condense each logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions without using a calculator. 12(log5x+log5y)−2log5(x+1)\(\frac{1}{2}\) \(\left\)( \(\log\)_5 x + \(\log\)_5 y \(\right\)) - 2 \(\log\)_5 (x + 1)

Guida verificata passo dopo passo
1
Start by applying the distributive property to the expression: multiply \( \frac{1}{2} \) by each term inside the parentheses. This gives \( \frac{1}{2} \log_5 x + \frac{1}{2} \log_5 y - 2 \log_5 (x + 1) \).
Use the power rule of logarithms, which states that \( a \log_b M = \log_b (M^a) \), to rewrite each term with coefficients as exponents inside the logarithms. So, \( \frac{1}{2} \log_5 x = \log_5 (x^{\frac{1}{2}}) \), \( \frac{1}{2} \log_5 y = \log_5 (y^{\frac{1}{2}}) \), and \( -2 \log_5 (x + 1) = \log_5 ((x + 1)^{-2}) \).
Now, rewrite the expression as the sum and difference of logarithms: \( \log_5 (x^{\frac{1}{2}}) + \log_5 (y^{\frac{1}{2}}) + \log_5 ((x + 1)^{-2}) \).
Apply the product rule of logarithms, which states \( \log_b A + \log_b B = \log_b (AB) \), to combine the first two terms: \( \log_5 (x^{\frac{1}{2}} y^{\frac{1}{2}}) + \log_5 ((x + 1)^{-2}) \).
Finally, use the product rule again to combine all terms into a single logarithm: \( \log_5 \left( x^{\frac{1}{2}} y^{\frac{1}{2}} (x + 1)^{-2} \right) \). This is the condensed form with coefficient 1.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
6m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Properties of Logarithms

Properties of logarithms include rules such as the product rule (log_b(m) + log_b(n) = log_b(mn)), the quotient rule, and the power rule (a·log_b(m) = log_b(m^a)). These allow combining or breaking down logarithmic expressions to simplify or condense them into a single logarithm.
Video consigliato:
5:36
Change of Base Property

Condensing Logarithmic Expressions

Condensing logarithmic expressions means rewriting multiple logarithms as one single logarithm. This involves applying the product, quotient, and power rules to combine terms, ensuring the final expression has a coefficient of 1 in front of the logarithm.
Video consigliato:
4:22
Expand & Condense Log Expressions

Evaluating Logarithms Without a Calculator

Evaluating logarithms without a calculator requires recognizing values that simplify to known logarithmic results, such as log_b(b) = 1 or log_b(1) = 0. Using properties to rewrite expressions can help identify these values and simplify the expression further.
Video consigliato:
5:14
Evaluate Logarithms
Pratica correlata
Domanda del libro di testo

The figure shows the graph of f(x) = ln x. In Exercises 65–74, use transformations of this graph to graph each function. Graph and give equations of the asymptotes. Use the graphs to determine each function's domain and range. g(x) = ln (x+2)

826
views
Domanda del libro di testo

In Exercises 64–73, solve each exponential equation. Where necessary, express the solution set in terms of natural or common logarithms and use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. 2^(4x-2) = 64

970
views
Domanda del libro di testo

The figure shows the graph of f(x) = ln x. In Exercises 65–74, use transformations of this graph to graph each function. Graph and give equations of the asymptotes. Use the graphs to determine each function's domain and range.

h(x) = ln (2x)

1360
views
Domanda del libro di testo

Solve each logarithmic equation in Exercises 49–92. Be sure to reject any value of xx that is not in the domain of the original logarithmic expressions. Give the exact answer. Then, where necessary, use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. lnx+3=1\(\ln\)\(\sqrt{x+3}\)=1

938
views
Domanda del libro di testo

Solve each logarithmic equation in Exercises 49–92. Be sure to reject any value of x that is not in the domain of the original logarithmic expressions. Give the exact answer. Then, where necessary, use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. log5 x+log5(4x−1)=1

861
views
Domanda del libro di testo

In Exercises 64–73, solve each exponential equation. Where necessary, express the solution set in terms of natural or common logarithms and use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. 10^x = 7000

1035
views