Answer
$$0$$ $$or$$ $$-4$$
Work Step by Step
$y^{2}-4y=y(y-4)$
$y(y-4)=0$ implies $y=0$ $or$ $y-4=0$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 0 - Section 0.3 - Multiplying and Factoring Algebraic Expressions - Exercises - Page 21: 32
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