Question
Asked Oct 24, 2019

Find the critical points for the function:

f(x,y)=x3+y3-9x2-48y-3

and use the Second Derivative Test to classify each as a local maximum, local minimum, saddle point, or none of these.

check_circleExpert Solution
Step 1

To determine the critical points for the function and classify the critical points.

Step 2

Given:

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Step 3

Concept Used:

The critical points of the function f(x,y) satisfy the condition fx = 0 and fy = 0  or fx and/or fy does not exist.

Calculate the discrim...

(a,b) S,, (a,b)-(a.b)
D D(a,b)
XX
If D <0 then the point (a,b) is a saddle point
If D 0 andf(a,b) 0 then (a,b) is relative minimum
If D 0 andf(a,b) < 0 then (a,b) is relative maximum
Xx
If D 0 then the test fails
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(a,b) S,, (a,b)-(a.b) D D(a,b) XX If D <0 then the point (a,b) is a saddle point If D 0 andf(a,b) 0 then (a,b) is relative minimum If D 0 andf(a,b) < 0 then (a,b) is relative maximum Xx If D 0 then the test fails

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Tagged in

Math

Calculus

Functions