- The document discusses solving a radical equation by isolating the radicals on each side of the equal sign and then squaring both sides.
- It provides an example of solving the equation 2x+4=x+7 by squaring both sides, simplifying, and finding the solution x=3.
- The final steps are to verify the solution by plugging it back into the original equation.
Measurement of Three Dimensional Figures _Module and test questions.Elton John Embodo
This is a fort-folio requirement in my Assessment in Student Learning 1...It consists of module about the measurement of Three Dimensional Figures and test questions like Completion, Short Answer, Essay, Multiple Choice and Matching Type.
MA 243 Calculus III Fall 2015 Dr. E. JacobsAssignmentsTh.docxinfantsuk
MA 243 Calculus III Fall 2015 Dr. E. Jacobs
Assignments
These assignments are keyed to Edition 7E of James Stewart’s “Calculus” (Early Transcendentals)
Assignment 1. Spheres and Other Surfaces
Read 12.1 - 12.2 and 12.6
You should be able to do the following problems:
Section 12.1/Problems 11 - 18, 20 - 22 Section 12.6/Problems 1 - 48
Hand in the following problems:
1. The following equation describes a sphere. Find the radius and the coordinates of the center.
x2 + y2 + z2 = 2(x + y + z) + 1
2. A particular sphere with center (−3, 2, 2) is tangent to both the xy-plane and the xz-plane.
It intersects the xy-plane at the point (−3, 2, 0). Find the equation of this sphere.
3. Suppose (0, 0, 0) and (0, 0, −4) are the endpoints of the diameter of a sphere. Find the
equation of this sphere.
4. Find the equation of the sphere centered around (0, 0, 4) if the sphere passes through the
origin.
5. Describe the graph of the given equation in geometric terms, using plain, clear language:
z =
√
1 − x2 − y2
Sketch each of the following surfaces
6. z = 2 − 2
√
x2 + y2
7. z = 1 − y2
8. z = 4 − x − y
9. z = 4 − x2 − y2
10. x2 + z2 = 16
Assignment 2. Dot and Cross Products
Read 12.3 and 12.4
You should be able to do the following problems:
Section 12.3/Problems 1 - 28 Section 12.4/Problems 1 - 32
Hand in the following problems:
1. Let u⃗ =
⟨
0, 1
2
,
√
3
2
⟩
and v⃗ =
⟨√
2,
√
3
2
, 1
2
⟩
a) Find the dot product b) Find the cross product
2. Let u⃗ = j⃗ + k⃗ and v⃗ = i⃗ +
√
2 j⃗.
a) Calculate the length of the projection of v⃗ in the u⃗ direction.
b) Calculate the cosine of the angle between u⃗ and v⃗
3. Consider the parallelogram with the following vertices:
(0, 0, 0) (0, 1, 1) (1, 0, 2) (1, 1, 3)
a) Find a vector perpendicular to this parallelogram.
b) Use vector methods to find the area of this parallelogram.
4. Use the dot product to find the cosine of the angle between the diagonal of a cube and one of
its edges.
5. Let L be the line that passes through the points (0, −
√
3 , −1) and (0,
√
3 , 1). Let θ be the
angle between L and the vector u⃗ = 1√
2
⟨0, 1, 1⟩. Calculate θ (to the nearest degree).
Assignment 3. Lines and Planes
Read 12.5
You should be able to do the following problems:
Section 12.5/Problems 1 - 58
Hand in the following problems:
1a. Find the equation of the line that passes through (0, 0, 1) and (1, 0, 2).
b. Find the equation of the plane that passes through (1, 0, 0) and is perpendicular to the line in
part (a).
2. The following equation describes a straight line:
r⃗(t) = ⟨1, 1, 0⟩ + t⟨0, 2, 1⟩
a. Find the angle between the given line and the vector u⃗ = ⟨1, −1, 2⟩.
b. Find the equation of the plane that passes through the point (0, 0, 4) and is perpendicular to
the given line.
3. The following two lines intersect at the point (1, 4, 4)
r⃗ = ⟨1, 4, 4⟩ + t⟨0, 1, 0⟩ r⃗ = ⟨1, 4, 4⟩ + t⟨3, 5, 4⟩
a. Find the angle between the two lines.
b. Find the equation of the plane that contains every point o ...
4. 2x 4 x 7 0.
Set up the equation so that
there will be one radical on
each side of the equal sign.
2x 4 x 7
Square both sides.
2x 4
2
x 7
2
Simplify.
2x + 4 = x + 7
x = 3
Verify your solution.
2x 4 x 7 0 Therefore, the
solution is
x = 3.
Solve
Solving Radical Equations
2(3) 4 3 7
10 10
0
L.S. R.S.
5. 0)105()23( xx
)105()23( xx
22
)105()23( xx
10523 xx
1022 x
x212
Isolate the radicals
Square both sides
Simplify
Subtract 3x from both sides
Add 10 to both sides
When there are two radicals on the same side of an
equation, isolate both radicals by moving one to the other
side of the equal sign.
x = 6
8. Pythagoras of Samos
• Lived in southern Italy
from 571 BC-495 BC
• Considered the first
true mathematician
• Used mathematics as a
means to understand
the natural world
• First to teach that the
earth was a sphere that
revolves around the sun
20. In a right triangle, the side opposite the right angle is
the longest side. It is the hypotenuse. The other
two sides are the legs of a right triangle.
legs
hypotenuse
21. In a right triangle, the sum of the squares of the
lengths of the legs is equal to the square of the length
of the hypotenuse.
a2 + b2 = c2
a
b
c
22. A right triangle has sides of lengths 20, 29,
and 21. What is the length of the
hypotenuse?
Verify that the Pythagorean Theorem is true
for the right triangle in the previous
question.
Find the length of the hypotenuse of a right
triangle with legs of lengths 7 and 24.
WHO? Czech-American mathematician
Olga Taussky-Todd (1906-1995) studied
Pythagorean triangles. In 1970, she won
the Ford Prize for her research
23. Find the value of x. Leave your answer in
simplest radical form.
The hypotenuse of a right triangle has length
12. one leg has length 6. Find the length of
the other leg in simplest radical form.
8
20
x
25. When the lengths of the sides of a right
triangle are integers, the integers form a
Pythagorean Theorem. Here are some
common primitive Pythagorean Triples.
3, 4, 5
5, 12, 13
8, 15, 17
7, 24, 25
Choose an integer. Multiply each number of
a Pythagorean triple by that integer. Verify
that the result is a Pythagorean triple.
9, 40, 41
11, 60, 61
12, 35, 37
13, 84, 85
26. What is the length of the diagonal of a rectangle
whose sides measures 5 and 7?
Calculate the length of the side of a square whose
diagonal measures 9 cm.
What is the measure of the longest stick we can
put inside a 3 cm x 4 cm x 5 cm box?
27. In ΔABC with longest side c,
if c2 = a2 + b2, then the triangle is right.
if c2 > a2 + b2, then the triangle is obtuse.
if c2 < a2 + b2, then the triangle is acute.
B
C A
a
b
c
28. a) 2, 3, 4
b) 3, 4, 5
c) 4, 5, 6
d) 3, 3, 3 2
e) 3, 3, 3 3
f) 2, 2 3, 4
g) 5, 5, 5
h) 4, 4, 5
i) 2, 2, 2
j) 2.5, 6, 6.5
The number represent the lengths of the sides
of a triangle (a, b, c). Classify each triangle as
acute, obtuse, or right.
obtuse
right
acute
right
obtuse
right
acute/equi
acute
right
right
29. a) 2, 3, 4
b) 3, 4, 5
c) 4, 5, 6
d) 3, 3, 3 2
e) 3, 3, 3 3
f) 2, 2 3, 4
g) 5, 5, 5
h) 4, 4, 5
i) 2, 2, 2
j) 2.5, 6, 6.5
The number represent the lengths of the sides
of a triangle (a, b, c). Classify each triangle as
acute, obtuse, or right.
obtuse
right
acute
right
obtuse
31. 23 x 12
3(2)2(2)+3(1)2(1)
672
= 276
18 x 37
8(7)
6
24 + 7+ 5
6
3+ 3
6
= 666
Work
Backward
Variables represent numbers that are unknown at the time. Even
after the variables are known, all of the rules of algebra still apply.
For example, let's foil these two terms:
60"
36"
x