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 .
find the zeros of the function algebraically:
f(x) = 9x2 - 3x - 2
Rylee's car is stuck in the mud. Roman and Shanice come along in a truck to help pull her out. They attach
one end of a tow strap to the front of the car and the other end to the truck's trailer hitch, and the truck
starts to pull. Meanwhile, Roman and Shanice get behind the car and push. The truck generates a
horizontal force of 377 lb on the car. Roman and Shanice are pushing at a slight upward angle and generate
a force of 119 lb on the car. These forces can be represented by vectors, as shown in the figure below. The
angle between these vectors is 20.2°. Find the resultant force (the vector sum), then give its magnitude
and its direction angle from the positive x-axis.
119 lb
20.2°
377 lb
Chapter 13 Solutions
Calculus Early Transcendentals, Binder Ready Version
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