Prove the following statement. For every real number x, if x − [x] ≥ 1/1/12 then [2x] = 2[x] + 1. Proof: Suppose x is any real number such that X- <- [x] ²/1/201 2[x] ≥ 1 or, equivalently, -Select--- Multiply both sides of the inequality by 2 to obtain 2x Now by definition of floor, x < [x] + 1, and hence ---Select--- (**). Put inequalities (*) and (**) together to obtain 2[x] + 1 ? 2x ? ✓ ---Select--- Thus, by definition of floor, [2x] = 2[x] + 1.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section2.6: Inequalities
Problem 80E
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Prove the following statement.
For every real number x, if x − [x] >
²1/1/1/1₁
Proof: Suppose x is any real number such that
then [2x]
2[x] + 1.
X- [x] = 1/2.
Multiply both sides of the inequality by 2 to obtain 2x - 2[x] ≥ 1 or, equivalently, --Select---
Now by definition of floor, x < [x] + 1, and hence ---Select---
(**).
Put inequalities (*) and (**) together to obtain 2[x] + 1 ? ✓ 2x ? ✓ ---Select--- ✓
Thus, by definition of floor, [2x] = 2[x] + 1.
(*).
Transcribed Image Text:Prove the following statement. For every real number x, if x − [x] > ²1/1/1/1₁ Proof: Suppose x is any real number such that then [2x] 2[x] + 1. X- [x] = 1/2. Multiply both sides of the inequality by 2 to obtain 2x - 2[x] ≥ 1 or, equivalently, --Select--- Now by definition of floor, x < [x] + 1, and hence ---Select--- (**). Put inequalities (*) and (**) together to obtain 2[x] + 1 ? ✓ 2x ? ✓ ---Select--- ✓ Thus, by definition of floor, [2x] = 2[x] + 1. (*).
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