Path of steepest descent Consider each of the following surfaces and the point P on the surface. a. Find the gradient of f. b. Let C’ be the path of steepest descent on the surface beginning at P and let C be the projection of C’ on the xy-plane. Find an equation of C in the xy-plane. 51 f ( x , y ) = 4 + x ( a plane ) ; P ( 4 , 4 , 8 )
Path of steepest descent Consider each of the following surfaces and the point P on the surface. a. Find the gradient of f. b. Let C’ be the path of steepest descent on the surface beginning at P and let C be the projection of C’ on the xy-plane. Find an equation of C in the xy-plane. 51 f ( x , y ) = 4 + x ( a plane ) ; P ( 4 , 4 , 8 )
Solution Summary: The author explains how the gradient of f(x,y)=4+x is computed as follows.
Path of steepest descentConsider each of the following surfaces and the point P on the surface.
a.Find the gradient of f.
b.Let C’ be the path of steepest descent on the surface beginning at P and let C be the projection of C’ on the xy-plane. Find an equation of C in the xy-plane.
51
f
(
x
,
y
)
=
4
+
x
(
a plane
)
;
P
(
4
,
4
,
8
)
Write the given third order linear equation as an equivalent system of first order equations with initial values.
Use
Y1 = Y, Y2 = y', and y3 = y".
-
-
√ (3t¹ + 3 − t³)y" — y" + (3t² + 3)y' + (3t — 3t¹) y = 1 − 3t²
\y(3) = 1, y′(3) = −2, y″(3) = −3
(8) - (888) -
with initial values
Y
=
If you don't get this in 3 tries, you can get a hint.
Question 2
1 pts
Let A be the value of the triple integral
SSS.
(x³ y² z) dV where D is the region
D
bounded by the planes 3z + 5y = 15, 4z — 5y = 20, x = 0, x = 1, and z = 0.
Then the value of sin(3A) is
-0.003
0.496
-0.408
-0.420
0.384
-0.162
0.367
0.364
Question 1
Let A be the value of the triple integral SSS₂ (x + 22)
=
1 pts
dV where D is the
region in
0, y = 2, y = 2x, z = 0, and
the first octant bounded by the planes x
z = 1 + 2x + y. Then the value of cos(A/4) is
-0.411
0.709
0.067
-0.841
0.578
-0.913
-0.908
-0.120
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