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Alenkasestr [34]
3 years ago
9

Find the critical points of the given function and then determine whether they are local maxima, local minima, or saddle points.

Mathematics
1 answer:
ASHA 777 [7]3 years ago
4 0

Answer:

y =-x ---- critical point

local minima

Step-by-step explanation:

Given

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

Required

Determine the critical point

Differentiate w.r.t x

f_x =2x + 2y

Differentiate w.r.t y

f_y =2y + 2x

Equate both to 0

2x + 2y =0

2y =0-2x

2y =-2x

Divide by 2

y =-x ----- in both equations

Hence:

The critical point is: y =-x

Solving (b):

We have:

f_x =2x + 2y

f_y =2y + 2x

This is represented as:

D = \left[\begin{array}{cc}2&2\\2&2\end{array}\right]

Calculate the determinant

|D| =2 * 2 -2 * 2

|D| = 4-4

|D| = 0

The critical point is at local minima

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