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Find (by hand) all asymptotes and extreme, and sketch a graph. $$y=\frac{x}{1-x^{4}}$$

Short Answer

Expert verified
The vertical asymptotes are \(x = -1, 1\) and the horizontal asymptote is \(y = 0\). The extreme point is in (0,0). The graph is symmetric along y-axis.

Step by step solution

01

Find Vertical Asymptotes

Vertical asymptotes occur when the denominator of the function equals zero and the numerator doesn't. Solve \(1-x^{4} = 0\) for \(x\), that gives \(x = -1, 1, -i, i\). Therefore, the vertical asymptotes are \(x = -1, 1\). We don't consider the complex roots.
02

Find Horizontal Asymptotes

Horizontal asymptotes are found by taking the limit of the function as \(x\) approaches infinity and negative infinity. Both limits are 0. Therefore, the horizontal asymptote is at \(y = 0\).
03

Find the Extrema

To find the extreme points, you should first find the derivative of the function: \(y' = \frac{1}{(1-x^{4})^{2}}\). This derivative equals zero when \(x = 0\). Plug this back into the original function to find the y-coordinate. So, the extreme point is at (0,0).
04

Sketch the Graph

Plotting the points and drawing the function, you can see a curve dipping down to (0,0), then rising up and approaching the asymptotes. It will approach the asymptotes, but never cross them. The graph will be symmetric along y-axis because the function is a rational function.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Vertical Asymptotes
Vertical asymptotes are crucial to understanding the behavior of rational functions as they indicate where the function heads toward infinity. To determine them, we look for values of the variable that make the denominator zero but leave the numerator nonzero. In the example of graphing the function \(y=\frac{x}{1-x^{4}}\), setting the denominator \(1-x^{4}\) to zero gives us potential asymptotes at \(x = -1\) and \(x = 1\), as complex numbers are not considered in real function domains.

Visualizing these asymptotes is akin to drawing invisible barriers that the graph can get infinitely close to but never cross. They define the boundaries beyond which the graph cannot extend, crucial for sketching a graph that represents the function's behavior accurately.

It's important to remember that vertical asymptotes are not part of the function's graph and, as such, represent undefined points within the function's domain.
Horizontal Asymptotes
Horizontal asymptotes provide a clear picture of a function's end behavior—how it acts as \(x\) goes to infinity or negative infinity. They are revealed by assessing the limits of the function at these extremes. For the function under consideration, \(y=\frac{x}{1-x^{4}}\), as \(x\) approaches infinity or negative infinity, the function's value gets closer and closer to 0. Thus, we identify \(y=0\) as a horizontal asymptote.

Being aware of horizontal asymptotes is particularly helpful when graphing the long-term trend of a function. It reflects the level to which the function will settle in eventually, though it might oscillate or deviate at lesser values of \(x\). Unlike vertical asymptotes, a function's graph may cross a horizontal asymptote.
Extreme Points of a Function
Extreme points of a function, also known as extrema, are where the function reaches its lowest or highest values—minima and maxima, respectively. Identifying these points provides insights into the function's behavior at specific intervals. Finding the extrema starts with deriving the function to get \(y' = \frac{1}{(1-x^{4})^{2}}\) for the given example. We then set the derivative equal to zero to find \(x\) coordinates of potential extrema.

For our function, \(y'\) is zero when \(x=0\), making the point \(0,0\) an extremum. By understanding where these extremes lie, you can better predict the function's turning points and their impacts on the graph's shape. This can be vitally important in applications like optimization problems, where extrema signify the most efficient or beneficial options.
Derivative of a Function
The derivative of a function plays a significant role in analyzing its behavior as it provides the rate of change at any given point. For the given function, \(y=\frac{x}{1-x^{4}}\), the derivative \(y' = \frac{1}{(1-x^{4})^{2}}\) helps us understand how fast the function is increasing or decreasing and where it has extrema.

Calculating derivatives is a fundamental concept of calculus, and its applications go beyond just finding extreme points. In physics, derivatives can represent acceleration, in economics, they might signify marginal costs or profits, and in our day-to-day life, they can be seen as the rate at which situations are changing. The ability to precisely determine derivatives allows for targeted predictions and interpretations of various phenomena described by functions.

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Most popular questions from this chapter

In Einstein's theory of relativity, the length of an object depends on its velocity. If \(L_{0}\) is the length of the object at rest, \(v\) is the object's velocity and \(c\) is the speed of light, the Lorentz contraction formula for the length of the object is \(L=L_{0} \sqrt{1-v^{2} / c^{2}}\) Treating \(L\) as a function of \(v,\) find the linear approximation of \(L\) at \(v=0\)

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