Chapter 9: Problem 19
a. Use a calculator to complete the table of values for \(f(x)=\log x .\) Round to the nearest hundredth. b. Graph \(f(x)=\log x .\) Note that the units on the \(x\) - and \(y\) -axes are different. $$ \begin{array}{|c|c|} \hline x & f(x) \\ \hline 0.5 & \\ 1 & \\ 2 & \\ 4 & \\ 6 & \\ 8 & \\ 10 & \\ \hline \end{array} $$ GRAPH CANNOT COPY
Short Answer
Step by step solution
Calculate the Value for x = 0.5
Calculate the Value for x = 1
Calculate the Value for x = 2
Calculate the Value for x = 4
Calculate the Value for x = 6
Calculate the Value for x = 8
Calculate the Value for x = 10
Graph the Function
Complete the Table and Sketch Graph
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Table of Values
- \(x = 0.5\): Calculating \(\log_{10} 0.5\), we find \(f(0.5) \approx -0.30\). This means the value is negative as 0.5 is less than 1.
- \(x = 1\): \(\log_{10} 1 = 0\). Since logarithm is an exponent, this result confirms that 10 raised to the 0 power is 1.
- \(x = 2\): For \(\log_{10} 2\), we get \(f(2) \approx 0.30\). This signifies only a slight increase, since 2 is close to 1.
- \(x = 4\): Calculating \(\log_{10} 4\), the result is \(f(4) \approx 0.60\), illustrating gradual growth.
- \(x = 6\): For \(\log_{10} 6\), we compute \(f(6) \approx 0.78\), further demonstrating this increase.
- \(x=8\): \(\log_{10} 8\) gives \(f(8) \approx 0.90\), showing that as \(x\) increases, \(f(x)\) also goes up.
- \(x = 10\): As already known, \(\log_{10} 10 = 1\), confirming the property of logarithms where the base itself results in 1.
Graphing Functions
Logarithms
- The base 10 logarithm, \( \log_{10} \), signifies what power a base number must be raised to yield a particular number.
- The concept of \( \log_{10} x = y \) means \( 10^y = x \).
- For values \( x < 1 \), the logarithms are negative. This reflects numbers that produce fractions when base 10 is raised to a power.
- At \( x = 1 \), logarithms return zero, indicating any number raised to the zero power results in 1.
- As values of \( x \) increase above 1, logarithms yield positive results, acknowledging the exponential growth of numbers.