find a function whose graph is the given curve

watchthesky30

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Sep 15, 2009
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I just need to know if i got this question right. thanks!

Find a function whose graph is the given curve:
The bottom half of the circle x²+y²=9
I got the answer y=± ?(9- x²)
-3?x?3

Though, since it's the bottom half of the circle, would it be y=-?(9- x²) [negative]
how would i simplify that further?
 
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