How Do General Plane Equations Differ from Tangent Surface Equations?

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SUMMARY

The discussion clarifies the distinction between the general plane equation, represented as a(x - x_0) + b(y - y_0) + c(z - z_0) = 0, and the tangent surface equation, z - z_0 = f_x (x_0, y_0)(x-x_0) + f_y (x_0, y_0)(y-y_0). The general plane equation utilizes the normal vector (a,b,c), while the tangent surface equation specifically employs the normal vector (f_x,f_y,-1). Both equations describe planes, but the tangent surface equation is a particular case related to the surface's slope at a given point.

PREREQUISITES
  • Understanding of multivariable calculus concepts
  • Familiarity with vector notation and normal vectors
  • Knowledge of surface equations and their geometric interpretations
  • Ability to manipulate algebraic equations
NEXT STEPS
  • Study the derivation of the general plane equation in multivariable calculus
  • Explore the concept of tangent planes and their applications in calculus
  • Learn about gradient vectors and their role in determining surface normals
  • Investigate the relationship between tangent surfaces and differential geometry
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Students of multivariable calculus, educators teaching geometry and calculus concepts, and anyone interested in the applications of tangent planes in mathematical analysis.

Calpalned
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Homework Statement


What's the difference between the two equations for a plane?

This question is somewhat related to my other, overarching question here: https://www.physicsforums.com/threads/i-am-confused-about-how-multivariable-calc-works.798798/

Homework Equations


## a(x - x_0) + b(y - y_0) + c(z - z_0) = 0 ##
and
## z - z_0 = f_x (x_0, y_0)(x-x_0) + f_y (x_0, y_0)(y-y_0) ##

The Attempt at a Solution


I'm not sure what the relationship between these two equations are. Thanks everyone.
 
Last edited:
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Calpalned said:

Homework Statement


What's the difference between the two equations for a plane?

Homework Equations


## a(x - x_0) + b(y - y_0) + c(z - z_0) = 0 ##
and
## z - z_0 = f_x (x_0, y_0)(x-x_0) + f_y (x_0, y_0)(y-y_0) ##

The Attempt at a Solution


I'm not sure what the relationship between these two equations are. Thanks everyone.

There's no deep difference. The first is the general form of a plane with ##(a,b,c)## as a normal vector. The second is a specific example of a plane corresponding to a tangent surface with normal vector ##(f_x,f_y,-1)##.
 

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