Mathematics for Machine Technology
7th Edition
ISBN: 9781133281450
Author: John C. Peterson, Robert D. Smith
Publisher: Cengage Learning
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Textbook Question
Chapter 41, Problem 10A
Express each ofthe word problems in Exercises 7 through 19 as equations. Let the unknown number equal x and by logical reasoning solve for the value of the unknown. Check the equation by comparing it to the word problem. Does the equation state mathematically what the problem states in words? Check whether the equation is balanced by substituting the value of the unknown in the equation.
A number divided by 4 equals 9. Find the number.
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Solve the linear system of equations attached using Gaussian elimination (not Gauss-Jordan) and back subsitution.
Remember that:
A matrix is in row echelon form if
Any row that consists only of zeros is at the bottom of the matrix.
The first non-zero entry in each other row is 1. This entry is called aleading 1.
The leading 1 of each row, after the first row, lies to the right of the leading 1 of the previous row.
7. Show that for R sufficiently large, the polynomial P(z) in Example 3, Sec. 5, satisfies
the inequality
|P(z)| R.
Suggestion: Observe that there is a positive number R such that the modulus of
each quotient in inequality (9), Sec. 5, is less than |an|/n when |z| > R.
9. Establish the identity
1-
1+z+z² +
2n+1
...
+z" =
1- z
(z1)
and then use it to derive Lagrange's trigonometric identity:
1
1+ cos cos 20 +... + cos no =
+
2
sin[(2n+1)0/2]
2 sin(0/2)
(0 < 0 < 2л).
Suggestion: As for the first identity, write S = 1+z+z² +...+z" and consider
the difference S - zS. To derive the second identity, write z =
eie in the first one.
Chapter 41 Solutions
Mathematics for Machine Technology
Ch. 41 - Prob. 1ACh. 41 - Prob. 2ACh. 41 - Prob. 3ACh. 41 - Prob. 4ACh. 41 - Prob. 5ACh. 41 - Prob. 6ACh. 41 - Prob. 7ACh. 41 - Express each ofthe word problems in Exercises 7...Ch. 41 - Express each ofthe word problems in Exercises 7...Ch. 41 - Express each ofthe word problems in Exercises 7...
Ch. 41 - Prob. 11ACh. 41 - Express each ofthe word problems in Exercises 7...Ch. 41 - Prob. 13ACh. 41 - Prob. 14ACh. 41 - Express each ofthe word problems in Exercises 7...Ch. 41 - Express each ofthe word problems in Exercises 7...Ch. 41 - Prob. 17ACh. 41 - Prob. 18ACh. 41 - The total amount of stock milled off an aluminum...Ch. 41 - Prob. 20ACh. 41 - In each of the following problems, refer to the...Ch. 41 - In each of the following problems, refer to the...Ch. 41 - In each of the following problems, refer to the...Ch. 41 - Prob. 24ACh. 41 - In each of the following problems, refer to the...Ch. 41 - In each of the following problems, refer to the...Ch. 41 - In each of the following problems, refer to the...Ch. 41 - In each of the following problems, refer to the...Ch. 41 - Prob. 29ACh. 41 - Prob. 30ACh. 41 - Solve for the unknown values in the following...Ch. 41 - Solve for the unknown values in the following...Ch. 41 - Prob. 33ACh. 41 - Prob. 34ACh. 41 - Solve for the unknown values in the following...Ch. 41 - Prob. 36ACh. 41 - Prob. 37ACh. 41 - Prob. 38ACh. 41 - Solve for the unknown values in the following...Ch. 41 - Solve for the unknown values in the following...Ch. 41 - Solve for the unknown values in the following...Ch. 41 - Solve for the unknown values in the following...Ch. 41 - Solve for the unknown values in the following...Ch. 41 - Solve for the unknown values in the following...Ch. 41 - Prob. 45ACh. 41 - Prob. 46A
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