USING DIRECT PROOF:  Prove: If x²-4=0, then x = 2 or x = -2.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section2.7: More On Inequalities
Problem 18E
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USING DIRECT PROOF: 

Prove: If x²-4=0, then x = 2 or x = -2.

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