-2z2 -y/2x-y2 if x=4, y= -2, and z= -5   I tried solving but I'm having no luck getting the correct answer.

PREALGEBRA
15th Edition
ISBN:9781938168994
Author:OpenStax
Publisher:OpenStax
Chapter3: Integers
Section3.5: Solve Equations Using Integers; The Division Property Of Equality
Problem 352E: Raoul started to solve the equation 4y=40by subtracting 4 from both sides. Explain why Raoul’s...
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-2z2 -y/2x-yif x=4, y= -2, and z= -5

 

I tried solving but I'm having no luck getting the correct answer. 

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