SOLUTION: Very confused on this question why isnt "y=3/4" the correct response to "Solve the equation y^2=9/16"?

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Question 874500: Very confused on this question
why isnt "y=3/4" the correct response to "Solve the equation y^2=9/16"?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
y^2=9/16
y = ± 3/4 (You were saying half the story)