Classify the following quadric surface

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In summary, the conversation discusses the solution to an equation of the form x^2-2xy+2y^2-2yz+z^2=0 by using the hint 2y^2=y^2+y^2 and the property of associativity. It is mentioned that completing the square is not necessary as the terms involved are already squares. Additionally, it is noted that the expansion of (a-b)^2 is a^2+ b^2= 0 if and only if a= b= 0.
  • #1
scolon94
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x2-2xy +2y2-2yz+z2=0
hint: 2y2=y2+y2
I thought of replacing 2y^2. But I'm not sure exactly what to do.
Thank you.
 
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  • #2
Use the given hint allow with the property of associativity to write:

\(\displaystyle \left(x^2-2xy+y^2 \right)+\left(y^2-2yx+z^2 \right)=0\)

Now do you see how to proceed?
 
  • #3
MarkFL said:
Use the given hint allow with the property of associativity to write:

\(\displaystyle \left(x^2-2xy+y^2 \right)+\left(y^2-2yx+z^2 \right)=0\)

Now do you see how to proceed?

I'm still confused because of the -2xy and -2yz. Is it possible to complete the square?
 
  • #4
scolon94 said:
I'm still confused because of the -2xy and -2yz. Is it possible to complete the square?

What is the expansion of $(a-b)^2$?
 
  • #5
The point is that you don't need to "complete the square"- those are already squares.

Also [tex]a^2+ b^2= 0[/tex] if and only if a= b= 0.
 

FAQ: Classify the following quadric surface

What is a quadric surface?

A quadric surface is a mathematical term used to describe a three-dimensional shape that can be represented by a second degree equation in three variables (x, y, z). It is a type of 3D surface that can be classified into different categories based on its characteristics.

How do you classify a quadric surface?

A quadric surface can be classified by its equation, which can help determine its shape and properties. It can also be classified based on its intersections with the coordinate planes and the types of conics that it contains.

What are the different types of quadric surfaces?

The different types of quadric surfaces include ellipsoids, hyperboloids, paraboloids, cones, and cylinders. These surfaces can further be classified into different categories based on their equations and properties.

What are the properties of quadric surfaces?

Quadric surfaces have several properties, including symmetry, curvature, and intersection with coordinate planes. They also have special properties such as foci, center, and axes of symmetry. These properties can help in classifying and understanding the shape of the surface.

How are quadric surfaces used in science?

Quadric surfaces are used in many areas of science, including physics, engineering, and computer graphics. They are used to represent real-world objects and phenomena, such as the shape of planets, electromagnetic fields, and 3D models. They also play an important role in the study of conic sections and their applications in science and mathematics.

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