Direction of steepest ascent and descent Consider the following functions and points P a. Find the unit vectors that give the direction of steepest ascent and steepest descent at P. b. Find a vector that points in a direction of no change in the function at P. 30 p ( x , y ) = 20 + x 2 + 2 x y − y 2 ; P ( 1 , − 2 )
Direction of steepest ascent and descent Consider the following functions and points P a. Find the unit vectors that give the direction of steepest ascent and steepest descent at P. b. Find a vector that points in a direction of no change in the function at P. 30 p ( x , y ) = 20 + x 2 + 2 x y − y 2 ; P ( 1 , − 2 )
Direction of steepest ascent and descentConsider the following functions and points P
a.Find the unit vectors that give the direction of steepest ascent and steepest descent at P.
b.Find a vector that points in a direction of no change in the function at P.
30
p
(
x
,
y
)
=
20
+
x
2
+
2
x
y
−
y
2
;
P
(
1
,
−
2
)
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
1. A bicyclist is riding their bike along the Chicago Lakefront Trail. The velocity (in
feet per second) of the bicyclist is recorded below. Use (a) Simpson's Rule, and (b)
the Trapezoidal Rule to estimate the total distance the bicyclist traveled during the
8-second period.
t
0 2
4 6 8
V
10 15
12 10 16
2. Find the midpoint rule approximation for
(a) n = 4
+5
x²dx using n subintervals.
1° 2
(b) n = 8
36
32
28
36
32
28
24
24
20
20
16
16
12
8-
4
1
2
3
4
5
6
12
8
4
1
2
3
4
5
6
=
5 37
A 4 8 0.5
06
9
Consider the following system of equations, Ax=b :
x+2y+3z - w = 2
2x4z2w = 3
-x+6y+17z7w = 0
-9x-2y+13z7w = -14
a. Find the solution to the system. Write it as a parametric equation. You can use a
computer to do the row reduction.
b. What is a geometric description of the solution? Explain how you know.
c. Write the solution in vector form?
d. What is the solution to the homogeneous system, Ax=0?
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