Question

F(x)=sqrt of (7-x)

Is the domain. X is less than or equal to 7?

@precal

Answer 1

For this problem, I'm assuming that they don't consider complex or imaginary numbers.
So in this case the square root can ONLY have non negative numbers.
Thus for:
\[f(x) = \sqrt{7-x}\]
We know that:
\[7-x \geq 0\]

Can you solve for x?

Once you solve for x, all you need to do is change it into interval notation.

Answer 2

wio is correct