Chapter 1: Problem 33
Starting with the graph of \(f(x)=6^{x}\) write the equation of the graph that results from a. reflecting \(f(x)\) about the \(x\) -axis and the \(y\) -axis b. reflecting \(f(x)\) about the \(x\) -axis, shifting left 2 units, and down 3 units
Short Answer
Expert verified
a. \(-6^{-x}\); b. \(-6^{x+2} - 3\).
Step by step solution
01
Understanding Reflections
A reflection about the x-axis changes the sign of the y-values, which transforms the graph of a function \( f(x) \) to \( -f(x) \). A reflection about the y-axis changes the x-values replacing \( x \) with \( -x \), thus transforming \( f(x) \) to \( f(-x) \).
02
Reflecting About the x- and y-axes
First, reflect \( f(x) = 6^x \) about the x-axis, giving \( -6^x \). Next, reflect about the y-axis, which means substituting \( x \) with \( -x \): \( -6^{-x} \). Therefore, the equation after reflecting about both axes is \( -6^{-x} \).
03
Reflecting About the x-axis
Reflect the function \( f(x) = 6^x \) about the x-axis, which gives \( -6^x \).
04
Shifting Left and Down
To shift the function 2 units to the left, we substitute \( x \) with \( x + 2 \), resulting in \( -6^{x+2} \). Then, to shift it down 3 units, we subtract 3 from the function: \( -6^{x+2} - 3 \).
05
Compile Complete Equation for Part b
The complete transformation reflecting about the x-axis, shifting left 2 units, and down 3 units is given by the equation \( -6^{x+2} - 3 \).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Reflecting Graphs
Reflections are a critical concept in understanding graph transformations. When reflecting a graph about the x-axis, you invert the y-values of the function. Essentially, this operation changes every point \( (x, y) \) to \( (x, -y) \), resulting in an upside-down image of the original graph. For the function \( f(x) = 6^x \), reflecting it about the x-axis transforms it to \( -6^x \). This flips the graph over the x-axis, making all the y-values negative.When reflecting about the y-axis, the x-values are inverted, which transforms each point \( (x, y) \) to \( (-x, y) \). For the same function \( f(x) = 6^x \), reflecting it about the y-axis gives us \( 6^{-x} \), flipping it along the y-axis. Combining these transformations on \( f(x) \) will produce \( -6^{-x} \), where the graph is both upside down and flipped left to right.
Exponential Functions
Exponential functions like \( f(x) = 6^x \) are fundamental in mathematics due to their rapid growth. In such functions, a constant base number is raised to a variable exponent. The base in \( 6^x \) is 6, indicating that as \( x \) increases, the value of \( f(x) \) grows exponentially.Some key characteristics of exponential functions include:
- They exhibit continuous and smooth curves.
- For base values greater than 1, the function increases rapidly as \( x \) becomes larger.
- They never touch the x-axis, but get infinitesimally close to it as \( x \) decreases.
Function Transformations
Function transformations involve altering the basic shape and position of a graph. Common transformations include reflections, translations, stretches, and compressions.Consider the base function \( f(x) = 6^x \). Through transformations, you can:
- Reflect: Change in orientation as discussed previously by reflecting across axes.
- Translate: Move the graph without changing its shape, such as shifting left/right or up/down.
- Stretch/Compress: Alter the graph's width or height, making it wider/narrower or taller/shorter.
Graph Translations
Graph translations involve sliding the graph of a function horizontally or vertically without changing its shape.Here’s how you can alter the position of \( f(x) = 6^x \):
- To shift a graph horizontally, replace \( x \) with \( x + h \). A positive \( h \) moves the graph left, while a negative \( h \) moves it right.
- To shift a graph vertically, modify the entire function by adding or subtracting a constant \( k \). Adding \( k \) moves the graph up, whereas subtracting moves it down.