For question 59E chapter 13.2 in book calculus eary transcend. Why we cannot apply the negative value of XYZ? The question says the square of XYZ, so even they have negative value, the square of them should be larger than zero. So isn't the correct answer be all points in the graph?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.6: Quadratic Functions
Problem 34E
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For question 59E chapter 13.2 in book calculus eary transcend. Why we cannot apply the negative value of XYZ? The question says the square of XYZ, so even they have negative value, the square of them should be larger than zero. So isn't the correct answer be all points in the graph?

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