Finding Points of Parallel Tangent Plane for z=(x^2)(e^y)

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SUMMARY

The discussion focuses on finding points on the graph of the function z = (x^2)(e^y) where the tangent plane is parallel to the plane defined by the equation 5x - 2y - 0.5z = 0. The key equations used include the formula for the tangent plane z = f(a,b) + fx(a,b)(x-a) + fy(a,b)(y-b) and the partial derivatives fx(x,y) = 2xe^y and fy(x,y) = (x^2)(e^y). The solution involves determining when the normal vectors of the tangent plane and the given plane are parallel, which can be approached through gradients or checking perpendicularity of the partial derivatives to the normal vector.

PREREQUISITES
  • Understanding of partial derivatives and their applications in multivariable calculus
  • Familiarity with the concept of tangent planes in three-dimensional space
  • Knowledge of normal vectors and their role in determining parallelism
  • Ability to manipulate and analyze equations of planes
NEXT STEPS
  • Study the derivation and application of the tangent plane formula in multivariable calculus
  • Learn about normal vectors and their significance in geometry and calculus
  • Explore the concept of gradients and their use in optimization problems
  • Investigate methods for determining parallelism between planes in three-dimensional space
USEFUL FOR

Students and educators in calculus, particularly those focusing on multivariable functions, as well as mathematicians interested in geometric interpretations of tangent planes and parallelism in three-dimensional contexts.

nirali35
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Homework Statement


Find the points on the graph of z=(x^2)(e^y) at which the tangent plane is parallel to 5x-2y-.5z=0


Homework Equations


An equation of the tangent plane to z=f(x,y) at (a,b) is:
z = f(a,b) + fx(a,b)(x-a) + fy(a,b)(y-b)


The Attempt at a Solution


Partial derivatives of function f(x,y)
fx(x,y) = 2xe^y => fx(a,b) = 2ae^b
fy(x,y) = (x^2)(e^y) => fy(a,b) = (a^2)(e^b)
 
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ideas from here? you could check when the plane normal vectors are parallel, or alternatively check when the directions of both the partial derivatives are perpindicular to the plane normal

you can also do this with graidents, but it amounts to a similar thing
 

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