Which of the following could be an example of a function with a range (-∞,a] and a domain [b,∞) where a

Question

Which of the following could be an example of a function with a range (-∞,a] and a domain [b,∞) where a < 0 and b < 0?

A.  f(x)=√x-a+b
   B.  f(x)=^3√(x-b)+a
   C.  f(x)=-^3√x+a-b
   D.  f(x)=-√x+b-a

anonymous · Answer

How deep are the roots?

anonymous · Answer

what?

anonymous · Answer

Ryan wants to know if the root is over all terms? like so
$$\sqrt{x-a+b}$$
Which I'm pretty sure it is not :)

anonymous · Answer

oh i understand no the root is only over the first two terms in each of the answer options

akshay_budhkar · Answer

see the domain of a square root is when the term inside it is greater than 0

akshay_budhkar · Answer

now if i am not wrong the cube root of a number can be negative.. so the term inside it just has to be real. so we eliminate B and C you get it?

anonymous · Answer

sort of so how do we eliminate a or d

hero · Answer

What the....I thought I helped you with this earlier...