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.
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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