Use a CAS to generate a contour plot of f x , y = 2 y 2 x − y x 2 + 4 x y for − 5 ≤ x ≤ 5 and − 5 ≤ y ≤ 5 , and use the plot to ap-proximate the locations of all relative extrema and saddle points in the region. Check your answer using calculus, and identify the extrema as relative maxima or minima .
Use a CAS to generate a contour plot of f x , y = 2 y 2 x − y x 2 + 4 x y for − 5 ≤ x ≤ 5 and − 5 ≤ y ≤ 5 , and use the plot to ap-proximate the locations of all relative extrema and saddle points in the region. Check your answer using calculus, and identify the extrema as relative maxima or minima .
Solution Summary: The author explains how to graph the function f(x,y) with the following commands in Maple.
f
x
,
y
=
2
y
2
x
−
y
x
2
+
4
x
y
for
−
5
≤
x
≤
5
and
−
5
≤
y
≤
5
,
and use the plot to ap-proximate the locations of all relative extrema and saddle points in the region. Check your answer using calculus, and identify the extrema as relative maxima or minima.
Formula Formula A function f(x) attains a local maximum at x=a , if there exists a neighborhood (a−δ,a+δ) of a such that, f(x)<f(a), ∀ x∈(a−δ,a+δ),x≠a f(x)−f(a)<0, ∀ x∈(a−δ,a+δ),x≠a In such case, f(a) attains a local maximum value f(x) at x=a .
A factorization A = PDP 1 is not unique. For A=
7 2
-4 1
1
1
5 0
2
1
one factorization is P =
D=
and P-1
30
=
Use this information with D₁
=
to find a matrix P₁ such that
-
-1 -2
0 3
1
-
- 1
05
A-P,D,P
P1
(Type an integer or simplified fraction for each matrix element.)
Matrix A is factored in the form PDP 1. Use the Diagonalization Theorem to find the eigenvalues of A and a basis for each eigenspace.
30 -1
-
1 0 -1
400
0
0 1
A=
3 4 3
0 1 3
040
3 1 3
0 0
4
1
0
0
003
-1 0 -1
Select the correct choice below and fill in the answer boxes to complete your choice.
(Use a comma to separate vectors as needed.)
A basis for the corresponding eigenspace is {
A. There is one distinct eigenvalue, λ =
B. In ascending order, the two distinct eigenvalues are λ₁
...
=
and 2
=
Bases for the corresponding eigenspaces are {
and ( ), respectively.
C. In ascending order, the three distinct eigenvalues are λ₁ =
=
12/2
=
and 3 = Bases for the corresponding eigenspaces are
{}, }, and {
respectively.
Chapter 13 Solutions
Calculus Early Transcendentals, Binder Ready Version
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