In the question y=x^4-x^2, the roots are 1,-1,0. I get why the -1 and 1 are roots but I don't get why 0 is a root.

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter1: Introduction To Algebra
Section1.8: Number Lines
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I am having trouble understanding roots. In the question y=x^4-x^2, the roots are 1,-1,0. I get why the -1 and 1 are roots but I don't get why 0 is a root. Can someone please explain?

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