Question

show that the function f(x,y,z) =
1/√(x^{2}+y^{2}+z^{2}) provides the
equation fxx + fyy + fzz = 0, called the 3−D Laplace equation.

Answer #1

Using partial differentiation we show that the given result.

Calculate ∫ ∫S f(x,y,z)dS for the given surface and function.
x2+y2+z2=144, 6≤z≤12; f(x,y,z)=z2(x2+y2+z2)−1.

Suppose that the function f(x, y) has continuous partial
derivatives fxx, fyy, and fxy at all points (x,y) near a critical
points (a, b). Let D(x,y) = fxx(x, y)fyy(x,y) – (fxy(x,y))2 and
suppose that D(a,b) > 0.
(a) Show that fxx(a,b) < 0 if and only if fyy(a,b) <
0.
(b) Show that fxx(a,b) > 0 if and only if fyy(a,b) >
0.

Evaluate ∫∫Sf(x,y,z)dS , where f(x,y,z)=0.4sqrt(x2+y2+z2)) and S
is the hemisphere x2+y2+z2=36,z≥0

Given the function f(x, y, z) = (x2 + y2 +
z2 )−1/2
a) what is the gradient at the point (12,0,16)?
b) what is the directional derivative of f in the direction of
the vector u = (1,1,1) at the point (12,0,16)?

Suppose f(x,y,z)=x2+y2+z2f(x,y,z)=x2+y2+z2 and WW is the solid
cylinder with height 55 and base radius 44 that is centered about
the z-axis with its base at z=−1z=−1. Enter θ as
theta.
with limits of integration
A = 0
B = 2pi
C = 0
D = 4
E = -1
F = 4
(b). Evaluate the integral

Use the method of Lagrange multipliers to find the minimum value
of the function
f(x,y,z)=x2+y2+z2
subject to the constraints x+y=10 and 2y−z=3.

Find the linear approximation of the function f(x, y, z) = x2 +
y2 + z2 at (6, 2, 9) and use it to approximate the number 6.012 +
1.972 + 8.982 . (Round your answer to five decimal places.) f(6.01,
1.97, 8.98) ≈

Find the minimum of f(x, y, z) = x2 + y2 +
z2 subject to the two constraints x + y + z = 1 and 4x +
5y + 6z = 10

Find fxx(x,y), fxy(x,y),
fyx(x,y), and fyy(x,y) for the function f
f(x,y)= 8xe3xy

Find the minimum of f(x,y,z) = x2 + y2 +
z2 subject to the two constraints x + 2y + z = 3 and x -
y = 4 by answering following questions
a) write out the lagrange equation involving lagrange
multipliers λ(lamba) and μ(mu)
b) solve for lamba in terms of x and y
c) solve for x,y,z using the constraints
d) determine the minimum value

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