Identifying domain help?

Using interval notation, identify the domain for the function:
f(x) = (sqrt)x+4

(A) [4, infinity)
(B) (-infinity, 4]
(C) [-4, infinity)
(D) (-infinity, -4]

Leaning towards A or C for starters because the bracket should be on the left side when listing the domain, right?

Question

Identifying domain help?

Using interval notation, identify the domain for the function:
f(x) = (sqrt)x+4

(A) [4, infinity)
(B) (-infinity, 4]
(C) [-4, infinity)
(D) (-infinity, -4]

Leaning towards A or C for starters because the bracket should be on the left side when listing the domain, right?

anonymous · Answer

i wanna help her ermm

ganeshie8 · Answer

thats a good start!

anonymous · Answer

i need to know her  guess first :O

anonymous · Answer

I'm not sure how the four can become a negative in this equation so to take a stab at the wind I'd say A @Marki

anonymous · Answer

wrong

ganeshie8 · Answer

$$f(x) = \sqrt{x+4}$$

assuming everything is real, you want the stuff inside radical to be not less than 0 because squareroot is not defined for negative numbers

anonymous · Answer

Wouldn't that leave C as my only option?

ganeshie8 · Answer

$$\large x+4 \ge  0$$

solve $x$

anonymous · Answer

x => -4?

anonymous · Answer

ahh I see now...

ganeshie8 · Answer

yes, in interval notation it would be
$$\large \left[-4, \infty \right)$$

anonymous · Answer

thank you so much, just got one more for now