Question

If the domain of the square root function f(x) is x<=7, which statement must be true?
7 is subtracted from the x-term inside the radical.
The radical is multiplied by a negative number.
7 is added to the radical term.
The x-term inside the radical has a negative coefficient.

Answer 1

A hint, inside the square root all must be positive (in real numbers), so
\[x\leq 7 \Rightarrow 0\leq 7-x\]

Answer 2

so subtract 7? @John_ES

Answer 3

Not exactly, do you see what the x has?

Answer 4

If you see it carefully you will find that the answer is the last one.