If the domain of the square root function f(x) is x

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.

anonymous · Answer

s = ut + ½ at2

anonymous · Answer

s = ut + 1/2 at2

anonymous · Answer

do you understand that domain in a different form...

anonymous · Answer

no, sorry.

anonymous · Answer

@CavebusterWatcher!

anonymous · Answer

Are  you sure it is not x>=7 because none of those answers work.

anonymous · Answer

Yeah, I'm sure. See for yourself.

jim_thompson5910 · Answer

you could do this trick x <= 7 x-7<=7-7 x-7 <= 0 -1*(x-7) >= -1*0 ... notice the sign flip -x + 7 >= 0 7 - x >= 0 ----------------------------------- or you can do it this way x <= 7 x-x <= 7-x 0 <= 7-x 7-x >= 0

jim_thompson5910 · Answer

either way, you go from x <= 7 to 7-x >= 0

anonymous · Answer

Is it the last option?

anonymous · Answer

The x has a negative coefficient

anonymous · Answer

I was considering that.

anonymous · Answer

Yeah, I think I'll go with that.