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Multivariable Calculus Partial Derivatives Test Review Flashcards | StudBud
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Multivariable Calculus Partial Derivatives Test Review
Multivariable Calculus Partial Derivatives Test Review
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Questions
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Answers
1
Is fxy at P positive or negative?
negative
positive
0
2
Given f(x, y, z) = x
30
y
26
z, what is f
xyzyzzyyxx
?
85700x27y22
0
4320x27y22
2360x27y22
3
Evaluate the limit:
Does not exist
2
infinity
0/0
4
A Pringle
TM
is an example of a(n) _____
hyperbolic paraboloid
potato chip
all of the above
a surface with a saddlepoint
5
I am ready for the test on Friday! True or False.
True
False
6
∇f(x, y), where f(x, y) = 10x
5
y is
<5x6/3, y2/2>
<10x5, y>
<50x4y, 10x5>
<50x4, 10x5>
7
The "D" in the multivariable second derivative test is:
fxxfyy + (fxy)2
fxxfyy - fxy
fxxfyy(fxy)2
fxxfyy - (fxy)2
8
A gradient points in what direction?
toward the center
tangent to the curve
up
maximum rate of change
9
The directional derivative of z = (x^2)(e^-y) at the point (-1,0) in the direction of (4,-3) is
-5
-1
-11/5
-3/5
10
Clairaut's Theorem states that _____
fxy = fxx
fxx = fyy
fxy = fyx
fx = fy
11
Which equation below gives the graph of this quadric surface?
x^2 + 2z^2 -6x - y + 10 = 0
4x^2 - y^2 + 2z^2 + 4 = 0
I don't know!
4x^2 - y^2 - z + 8x + 8z + 24 = 0
12
A gradient is a(n) _____
scalar
vector
integral
number
13
If f
xx
f
yy
- (f
xy
)
2
< 0, this means . . .
its time to move on.
No solution
there is a rel. extremum
saddle point
14
Given f(x,y) below and x = sin(2t) and y = cos t, find dz/dt when t = 0.
-6
6
0
3
15
A gradient at a point will behave
how
relative to a level curve?
any direction
parallel
tangent
perpendicular
16
Find the equation of the tangent plane to f(x,y) = (e^x)(Cos y) at the point (0,0,1).
z = 2x + y
z = y + 1
z = x + y + 1
z = x + 1
17
The "Lagrange multiplier" method is
a way to integrate with 3 variables
always equal to π
a way to solve constraint problems
a greek letter
18
See question...
12 and 8
12 and -8
8 and 16
16 and 8