Maximum gradient of a normal to the curve

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SUMMARY

The discussion focuses on determining the maximum gradient of a normal line to a curve, specifically addressing a homework problem that involves differentiating the normal line's equation. The solution involves differentiating the normal's gradient function and setting it to zero to find stationary points. Participants emphasize the relationship between tangent and normal lines, noting that the normals form a family of lines intersecting the curve at every point. Understanding the definitions of gradient and stationary points is crucial for solving this problem.

PREREQUISITES
  • Understanding of calculus concepts, specifically differentiation
  • Familiarity with the definitions of tangent and normal lines
  • Knowledge of stationary points in mathematical functions
  • Ability to differentiate simple functions
NEXT STEPS
  • Study the concept of differentiating implicit functions
  • Learn about the properties of tangent and normal lines in calculus
  • Explore stationary points and their significance in curve analysis
  • Practice problems involving maximum and minimum gradients of curves
USEFUL FOR

Students studying calculus, particularly those tackling problems related to curve analysis, tangent and normal lines, and optimization techniques.

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Homework Statement



complete problem attached

Homework Equations





The Attempt at a Solution


part I in this question was a bit tricky but i managed to solve it , when i read part II i understood nothing , he usually asks about the tangent not the normal , he asks about the point where the gradient of the normal is maximum and i have no idea how to get this , when i read the answers he said we should differentiate again then = it to 0 to find x , why did this work?
 

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The tangent lines intersecting the given equation form a family, one for each point. Right?
The normal line is simply obtained from any straight line, right?
That makes the set of normals a family of lines intersecting the given eqn at every point on it.
From there, it is a simple application of the definition of gradient. Oh, and obviously of finding the stationary points of that family. Not sure what else to tell you. It seems to be straighforward algebra as long as you understand what the various things are you are dealing with (and can differentiate simple functions).
 
i got it...thanks
 

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