Question

Please help me with precal

Answer 1

Consider the function
`f(x)=√(x).` This function has:

• the domain
  `x\in [0,\infty);`
• the range
  `y\in [0,\infty).`

If the domain of unknown function is
`[a,\infty),` then
`x\ge a` or
`x-a\ge 0.` This means that you have
`√(x-a)` as a part of needed function.

If the range of unknown function is
`[b,\infty),` then
`y\ge b.` This means that you have to translate function b units up and then the expression of the function is

`y=√(x-a)+b.`

Answer: correct choice is B.