Question

The domain of real function $f\left(x\right)=\sqrt{25-x^2}$ is

• A. [ -5, 5]
• B. ( -5, 5 )
• C. [ 0, 5 ]
• D. ( 0, 5 )

Answer 1

The correct option is A

[ -5, 5]

$25-x^2\ge 0\Rightarrow x^2-25\le 0\Rightarrow xϵ[-5,5]$