Stationary Point after Partial Differentiation

In summary, a stationary point after partial differentiation is a point on a graph where the derivative is equal to zero, indicating a potential maximum, minimum, or saddle point. To find a stationary point, take the partial derivative, set it equal to zero, and solve for the variables. A stationary point on a graph can indicate a maximum, minimum, or saddle point, and its type can be determined by analyzing the second derivative. Identifying stationary points is important for understanding the behavior of a function and for optimization problems. Multiple stationary points can exist on a graph, and each one should be analyzed to determine its type and location.
  • #1
ZedCar
354
1

Homework Statement


A question in a book has partially differentiated a function

f(x,y) = x^2 + 8xy^2 + 2y^2

df/dx = 2x + 8y^2 = 0 at stationary point (eqn 1)
df/dy = 16xy + 4y = 0 at stationary point (eqn 2)


Homework Equations





The Attempt at a Solution



It then states;

From (eqn 2) either
y = 0, or 16x + 4 = 0
y = 0, or x = -1/4

I can understand how y=0, but how do they conclude that 16x + 4 = 0

Thank you
 
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  • #2
I've realized they've just factored out the y!
 

Related to Stationary Point after Partial Differentiation

What is a stationary point after partial differentiation?

A stationary point after partial differentiation is a point on a graph where the derivative or slope is equal to zero. This point indicates a potential maximum, minimum, or saddle point on the graph.

How do you find a stationary point after partial differentiation?

To find a stationary point after partial differentiation, you must first take the partial derivative of the function with respect to each variable. Then, set each derivative equal to zero and solve for the variables. The resulting values of the variables will give the coordinates of the stationary point.

What does a stationary point indicate on a graph?

A stationary point on a graph indicates a potential maximum, minimum, or saddle point. The type of stationary point can be determined by analyzing the second derivative at that point. A positive second derivative indicates a minimum, a negative second derivative indicates a maximum, and a zero second derivative indicates a saddle point.

Why is it important to identify stationary points?

Identifying stationary points is important because they provide valuable information about the behavior of a function. They can help us determine the maximum or minimum values of a function, which can be useful in optimization problems. Stationary points also help us understand the shape and direction of a graph.

Can there be more than one stationary point on a graph?

Yes, there can be more than one stationary point on a graph. In fact, a function can have multiple stationary points, depending on the complexity of the function. It is important to analyze each stationary point to determine the type and location on the graph.

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