SOLUTION: 5-x^2 How do I know what the range is? I thought it would be [5, - infinity) but I think I'm wrong.

Algebra ->  Functions -> SOLUTION: 5-x^2 How do I know what the range is? I thought it would be [5, - infinity) but I think I'm wrong.       Log On


   

Question 780512: 5-x^2
How do I know what the range is? I thought it would be [5, - infinity) but I think I'm wrong.
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
5-x^2
How do I know what the range is?
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y=5-x^2
solve for x in terms of y
x^2=5-y
x=±√(5-y)
5-y≥0
-y≥-5
y≤5
Range: (-∞,5]