proof that: x^8 + x^6 - 4x^4 + x^2 + 4 > 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.4: Fractional Expressions
Problem 68E
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proof that:

x^8 + x^6 - 4x^4 + x^2 + 4 > 0

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