Example 11 : Show that 32 is irrational. Solution : Let us assume, to the contrary, that 3-/2 is rational. That is, we can find coprime a and b (b+ 0) such that 3/2 = b а Rearranging, we get /2 = - 3h а Since 3, a and b are integers, is rational, and so 5 is rational. 3b But this contradicts the fact that 2 is irrational. So, we conclude that 32 is irrational.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.2: Exponents And Radicals
Problem 92E
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Please explain easy language
A 4G
10:54 PM O O
Since a and b are integers, we get 5
60%
a
is rational, and so /3 is ration
b.
BL this conNCERT-Books-!5 Irate
This contradiction has arisen because of our incorrect assumption that
rational.
So, we conclude that 5 – V3 is irrational.
Example 11 : Show that 3/2 is irrational.
Solution : Let us assume, to the contrary, that 3/2 is rational.
That is, we can find coprime a and b (b# 0) such that 3/2 =".
a
Rearranging, we get /2
3h
a
is rational, and so
3b
Since 3, a and b are integers,
V2 is rational.
But this contradicts the fact that 2 is irrational.
So, we conclude that 3,5 is irrational.
EXERCISE 1.3
1. Prove that 5 is irrational.
2. Prove that 3+ 2/5 is irrational.
3. Prove that the following are irrationals :
1
(i)
(i) 7/5
(iї) 6+ /2
2018-19
REAL NUMBERS
1.5 Revisitin Rational Numrs and Their Dcimal Expansion
In Class IX, you studied that rational numbers have either a terminat
...
Transcribed Image Text:A 4G 10:54 PM O O Since a and b are integers, we get 5 60% a is rational, and so /3 is ration b. BL this conNCERT-Books-!5 Irate This contradiction has arisen because of our incorrect assumption that rational. So, we conclude that 5 – V3 is irrational. Example 11 : Show that 3/2 is irrational. Solution : Let us assume, to the contrary, that 3/2 is rational. That is, we can find coprime a and b (b# 0) such that 3/2 =". a Rearranging, we get /2 3h a is rational, and so 3b Since 3, a and b are integers, V2 is rational. But this contradicts the fact that 2 is irrational. So, we conclude that 3,5 is irrational. EXERCISE 1.3 1. Prove that 5 is irrational. 2. Prove that 3+ 2/5 is irrational. 3. Prove that the following are irrationals : 1 (i) (i) 7/5 (iї) 6+ /2 2018-19 REAL NUMBERS 1.5 Revisitin Rational Numrs and Their Dcimal Expansion In Class IX, you studied that rational numbers have either a terminat ...
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