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Y^2=4 Y=?

 Jul 1, 2017
 #1
avatar+7348 
+3

Y2  =  4                    Take the  ± square root  of both sides.

Y    =  ±√4

Y    =  ± 2

 Jul 1, 2017
 #2
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0

y2 = 4

y=2

because you can take the square root from y2 which gives you y and then take the square root of 4 which is equivalent to 2.

 Jul 1, 2017
 #3
avatar+95375 
+2

Sorry guest but Hectictar is correct   :)

 

By convention

\(\sqrt{y^2}=+y\)

that is true

 

BUT this is different becasuse the square root sign is not in the question. So

If

\(y^2=4\\ then\\ y=\pm\sqrt4=\pm2\)

.
 Jul 2, 2017

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