math question?

Question

how do you find the domain of a square root

Answer 1

The domain would be [0, infinity)
If f(x) = sqrt(x), then x >= 0.
If x<0, f(x) is imaginary and hence not part of the real domain.

Answer 2

Let's start with the square root of x.
We know that we can not have a square root of a negative number. So, the domain is greater than or equal to 0.
Now, let's try something a bit tougher. We will do the square root(4+2x)
4+2x must be greater than or equal to 0.
4+2x>0
2x>-4
x>-2
The domain is all numbers greater than or equal to -2.

Answer 3

dont know