Chapter 4: Problem 45
Use transformations of the graph of either \(f(x)=\frac{1}{x}\) or \(h(x)=\frac{1}{x^{2}}\) to sketch a graph of \(y=g(x)\) by hand. Show all asymptotes. Write \(g(x)\) in terms of either \(f(x)\) or \(h(x)\) $$ g(x)=\frac{1}{x-3} $$
Short Answer
Expert verified
The graph of \(g(x) = \frac{1}{x-3}\) is \(f(x)\) shifted 3 units right, with vertical asymptote at \(x=3\).
Step by step solution
01
Identify the Base Function
The given function is \(g(x) = \frac{1}{x-3}\). The base function for this equation is \(f(x) = \frac{1}{x}\). This is because the transformation involves a shift in the denominator and our function still has the form \(\frac{1}{x}\).
02
Analyze the Transformation
The function \(g(x) = \frac{1}{x-3}\) can be obtained by horizontally translating the graph of \(f(x) = \frac{1}{x}\) to the right by 3 units. This shift affects the vertical asymptote of \(f(x)\), moving it from \(x = 0\) to \(x = 3\).
03
Write in Terms of Base Function
Since the relationship between \(g(x)\) and \(f(x)\) is a horizontal shift, we can express the function as \(g(x) = f(x-3)\). This shows the shift in input that results in a translation of the graph.
04
Sketch the Graph
To sketch \(g(x) = \frac{1}{x-3}\), start by drawing the graph of \(f(x) = \frac{1}{x}\). Then shift the entire graph to the right by 3 units. The vertical asymptote moves from \(x = 0\) to \(x = 3\), and the horizontal asymptote remains at \(y = 0\). The curve approaches the new asymptotes in the same way as the original graph.
05
Identify Asymptotes
After the transformation, the graph of \(g(x) = \frac{1}{x-3}\) has a vertical asymptote at \(x = 3\). The horizontal asymptote remains unchanged at \(y = 0\) as there were no vertical shifts.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Horizontal Translation
A horizontal translation involves shifting the graph of a function along the x-axis by a certain number of units. This is a type of transformation that doesn't affect the shape of the graph, much like sliding a piece of paper in one direction. In the context of the original function, when we see an expression such as \(g(x) = \frac{1}{x-3}\), we interpret this as a horizontal shift.For the function \(f(x) = \frac{1}{x}\), when it is transformed to \(g(x) = \frac{1}{x-3}\), the graph of \(f(x)\) is moved 3 units to the right. Each point on the graph is relocated to a position 3 units further along the x-axis.
- The horizontal asymptote remains unchanged because we haven't transformed the function vertically.
- The movement only affects the vertical asymptote, which shifts from \(x = 0\) to \(x = 3\).
Vertical Asymptotes
Vertical asymptotes are imaginary lines where the function approaches but never really touches or crosses. They represent values of \(x\) at which a function is undefined due to division by zero. These vertical lines profoundly influence the behavior of functions, especially rational functions that can exhibit asymptotes prominently.In our transformation with \(g(x) = \frac{1}{x-3}\), the vertical asymptote originally present at \(x = 0\) in \(f(x) = \frac{1}{x}\) shifts to \(x = 3\) due to the horizontal translation. This shift reflects that now for \(g(x)\), the function becomes undefined when \(x = 3\).
- The graph will get infinitely close to this line, but it will never touch or cross \(x = 3\).
- Understanding vertical asymptotes helps in predicting where graphs will have a break or gap due to undefined values.
Inverse Functions
Inverse functions essentially "undo" the operation of the original function, switching the roles of input and output. If you have a function \(y = f(x)\), an inverse function swaps the \(x\) and \(y\). It is denoted often as \(f^{-1}(x)\) and fulfills the property \(f(f^{-1}(x)) = x\).While structural transformation itself doesn't directly involve inverse functions, understanding them can enhance how we grasp horizontal translations. For instance, the inverse of a simple transformation effects how a function is shifted or reversed back along the axes.
- The transformations we perform, like horizontal translations, do not necessarily create inverses but do influence input-output dynamics when inverses are considered.
- Visualizing this can help in seeing how each point's movement affects both the original and inverse functions.