Looking ahead—tangent planes Consider the following surfaces f ( x, y, z ) = 0, which may be regarded as a level surface of the function w = f ( x, y z ) . A point P ( a. b, c ) on the surface is also given. a. Find the ( three-dimensional) gradient off and evaluate it at P b. The set of all vectors orthogonal to the gradient with their tails at P form a plane. Find an equation of that plane ( soon to be called the tangent plane ) . 73. f ( x , y , z ) = e x + y − z − 1 = 0 ; P ( 1 , 1 , 2 )
Looking ahead—tangent planes Consider the following surfaces f ( x, y, z ) = 0, which may be regarded as a level surface of the function w = f ( x, y z ) . A point P ( a. b, c ) on the surface is also given. a. Find the ( three-dimensional) gradient off and evaluate it at P b. The set of all vectors orthogonal to the gradient with their tails at P form a plane. Find an equation of that plane ( soon to be called the tangent plane ) . 73. f ( x , y , z ) = e x + y − z − 1 = 0 ; P ( 1 , 1 , 2 )
Solution Summary: The author explains that the gradient of f(x,y,z)=ex+y-z
Looking ahead—tangent planesConsider the following surfaces f(x, y, z) = 0, which may be regarded as a level surface of the function w = f(x, y z). A point P(a. b, c) on the surface is also given.
a.Find the (three-dimensional) gradient off and evaluate it at P
b.The set of all vectors orthogonal to the gradient with their tails at P form a plane. Find an equation of that plane (soon to be called the tangent plane).
73.
f
(
x
,
y
,
z
)
=
e
x
+
y
−
z
−
1
=
0
;
P
(
1
,
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.
ints) A common representation of data uses matrices and vectors, so it is helpful
to familiarize ourselves with linear algebra notation, as well as some simple operations.
Define a vector ♬ to be a column vector. Then, the following properties hold:
• cu with c some constant, is equal to a new vector where every element in cv is equal
to the corresponding element in & multiplied by c. For example, 2
2
=
● √₁ + √2 is equal to a new vector with elements equal to the elementwise addition of
₁ and 2. For example,
問
2+4-6
=
The above properties form our definition for a linear combination of vectors. √3 is a
linear combination of √₁ and √2 if √3 = a√₁ + b√2, where a and b are some constants.
Oftentimes, we stack column vectors to form a matrix. Define the column rank of
a matrix A to be equal to the maximal number of linearly independent columns in
A. A set of columns is linearly independent if no column can be written as a linear
combination of any other column(s) within the set. If all…
The graph of f(x) is given below. Select each true statement about the continuity of f(x) at x = 3.
Select all that apply:
7
-6-
5
4
3
2
1-
-7-6-5-4-3-2-1 1 2 3 4 5 6 7
+1
-2·
3.
-4
-6-
f(x) is not continuous at a
=
3 because it is not defined at x = 3.
☐
f(x) is not continuous at a
=
- 3 because lim f(x) does not exist.
2-3
f(x) is not continuous at x = 3 because lim f(x) ‡ ƒ(3).
→3
O f(x) is continuous at a = 3.
Is the function f(x) continuous at x = 1?
(z)
6
5
4
3.
2
1
0
-10
-9
-7
-5
-2
-1 0
1
2
3
4
5
6
7
8
9
10
-1
-2
-3
-4
-5
-6
-7
Select the correct answer below:
○ The function f(x) is continuous at x = 1.
○ The right limit does not equal the left limit. Therefore, the function is not continuous.
○ The function f(x) is discontinuous at x = 1.
○ We cannot tell if the function is continuous or discontinuous.
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