Prove that for each real number x and each irrational number q, (x +q) is irrational or (x-q) is irrational.

Intermediate Algebra
10th Edition
ISBN:9781285195728
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter7: Equations And Inequalities In Two Variables
Section7.1: Rectangular Coordinate System And Linear Equations
Problem 59PS: Now lets use a graphing calculator to get a graph of C=59(F32). By letting F=x and C=y, we obtain...
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their slopes 1s equal to -1.
3. Are the following statements true or false? Justify your conclusions.
(a) For each integer a, if 3 does not divide a, then 3 divides 2a2 + 1.
(b) For each integer a, if 3 divides 2a2 + 1, then 3 does not divide a.
(c) For each integer a, 3 does not divide a if and only if 3 divides 2a2 +1.
4. Prove that for each real number x and each irrational number q, (x +q) is
irrational or (x -q) is irrational.
5. Prove that there exist irrational numbers u and v such that u is a rational
number.
Hint: We have proved that v2 is irrational. For the real number q
either q is rational or q is irrational. Use this disjunction to set up two cases.
6. (Exercise (17), Section 3.2) Let a and b be natural numbers such that a2
Dorte (6a) through (6d) (The results of
Transcribed Image Text:their slopes 1s equal to -1. 3. Are the following statements true or false? Justify your conclusions. (a) For each integer a, if 3 does not divide a, then 3 divides 2a2 + 1. (b) For each integer a, if 3 divides 2a2 + 1, then 3 does not divide a. (c) For each integer a, 3 does not divide a if and only if 3 divides 2a2 +1. 4. Prove that for each real number x and each irrational number q, (x +q) is irrational or (x -q) is irrational. 5. Prove that there exist irrational numbers u and v such that u is a rational number. Hint: We have proved that v2 is irrational. For the real number q either q is rational or q is irrational. Use this disjunction to set up two cases. 6. (Exercise (17), Section 3.2) Let a and b be natural numbers such that a2 Dorte (6a) through (6d) (The results of
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