Chapter 11: Problem 6
Name and sketch the graph of each of the following equations in three-space. $$2 x^{2}-16 z^{2}=0$$
Short Answer
Expert verified
The graph is a set of parallel lines along the y-axis, forming a degenerate hyperbola in the x-z plane.
Step by step solution
01
Simplify the Equation
Start by dividing the entire equation by 2 to simplify it: \[ x^2 - 8z^2 = 0 \]
02
Rearrange the Equation
Rearrange the equation to isolate the terms with the variables on opposite sides:\[ x^2 = 8z^2 \]
03
Identify the Type of Surface
This equation resembles a hyperboloid of one sheet in the 2D x-z plane. It represents a degenerate hyperbola centered at the origin with axes along the x-axis and the z-axis.
04
Sketch the Graph
To sketch this surface in 3D space, recognize that it represents two intersecting lines in the x-z plane. In three-dimensional space, this set of lines repeats across any value of y, so the graph consists of parallel lines along the y-axis.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Hyperbola and Its Properties
A hyperbola is a type of conic section that occurs when a plane intersects both halves of a double cone, forming an open curve. Think of it as two mirrored curves that extend indefinitely. Each curve of a hyperbola is called a 'branch'. One key property of a hyperbola is that each point on the hyperbola has a constant difference in distance to two fixed points called the foci.
Hyperbolas can be represented by equations in the form \( rac{x^2}{a^2} - rac{y^2}{b^2} = 1 \), where the transverse axis lies along the x-axis or y-axis, depending on the equation's configuration. The variables \(a\) and \(b\) determine the shape of the hyperbola. Changing these values stretches or contracts the hyperbola along the axes.[
Hyperbolas can be represented by equations in the form \( rac{x^2}{a^2} - rac{y^2}{b^2} = 1 \), where the transverse axis lies along the x-axis or y-axis, depending on the equation's configuration. The variables \(a\) and \(b\) determine the shape of the hyperbola. Changing these values stretches or contracts the hyperbola along the axes.[
- Hyperbolas are symmetrical about both their axes.
- They have asymptotes, which are lines that the branches approach but never touch.
Hyperboloid: Understanding a Simple Surface
While a hyperbola is a two-dimensional figure, adding a third dimension creates a surface known as a hyperboloid. A hyperboloid can be thought of as a three-dimensional analog to hyperbolas. There are two types of hyperboloids: of one sheet and of two sheets. They appear quite different from each other in shape.
In this exercise's context, the simplified equation \( x^2 - 8z^2 = 0 \) describes a specific type of surface called a degenerate hyperboloid. This means that instead of a typical hyperboloid shape, it simplifies to form intersecting lines. In a hyperboloid of one sheet, the surface can appear as a continuous, curvy surface that looks like a saddle, whereas the hyperboloid of two sheets consists of two separate, bowl-like shapes.
In this exercise's context, the simplified equation \( x^2 - 8z^2 = 0 \) describes a specific type of surface called a degenerate hyperboloid. This means that instead of a typical hyperboloid shape, it simplifies to form intersecting lines. In a hyperboloid of one sheet, the surface can appear as a continuous, curvy surface that looks like a saddle, whereas the hyperboloid of two sheets consists of two separate, bowl-like shapes.
- Hyperboloids are central to many structural designs, such as cooling towers and hyperbolic structures in architecture.
- The degenerate form related to intersecting lines gives a unique insight into understanding how conic sections transition into different forms.
Intersecting Lines in Three-dimensional Graphs
Intersecting lines in three-dimensional space can be a bit tricky to visualize but play a crucial role in understanding complex geometrical shapes. In our exercise, the equation simplifies to essentially represent two intersecting lines in the \(x-z\) plane.
When graphed in three dimensions, these intersecting lines create a repeatable pattern across any value of \(y\), leading to a series of parallel lines along the y-axis. This means that for every slice or cross-section parallel to the \(y\)-axis, you'll see the same pair of intersecting lines.
When graphed in three dimensions, these intersecting lines create a repeatable pattern across any value of \(y\), leading to a series of parallel lines along the y-axis. This means that for every slice or cross-section parallel to the \(y\)-axis, you'll see the same pair of intersecting lines.
- Intersecting lines can be thought of as a basic unit of more complex surfaces, making them fundamental in geometry.
- Visualizing these in 3D cultivates a deeper understanding of how planes and lines interact within spatial graphs.