Posted by Christa on Sunday, August 14, 2011 at 9:01pm.
f(x)=√(25-x²)
For f(x) to be real, we require that the expression 25-x² be non-negative, i.e.
25-x²≥0 ....(1)
(1) is satisfied when
|x|≤5,
or x∈[-5,5] which is exactly the domain of f(x).
The range of f(x) varies from 0 when x=±5 to 5 when x=0.
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