# Thread: Simple Domain and Range

1. ## Simple Domain and Range

hey all

Im just starting computer science at uni, Whilst I can do calculas for some unknown reason I dont remember how to find the domain and range of

y=1+sqrt(x)

What I have gotten is

D: >=1
R: >=0

Just not sure if that is correct

2. Originally Posted by Bastler
hey all

Im just starting computer science at uni, Whilst I can do calculas for some unknown reason I dont remember how to find the domain and range of

y=1+sqrt(x)

What I have gotten is

D: >=1
R: >=0

Just not sure if that is correct
no.

the domain of $\sqrt{x}$ is $x \ge 0$. so that is the domain of your function

the range of $\sqrt{x}$ is $y \ge 0$. so, the range of $1 + \sqrt{x}$ is $y \ge 1$

remember, the domain is the set of all input values (in this case, x-values) for our function. the range is the set of all output values (y-values) for which our function is defined.

3. Originally Posted by Jhevon
no.

the domain of $\sqrt{x}$ is $x \ge 0$. so that is the domain of your function

the range of $\sqrt{x}$ is $y \ge 0$. so, the range of $1 + \sqrt{x}$ is $y \ge 1$

remember, the domain is the set of all input values (in this case, x-values) for our function. the range is the set of all output values (y-values) for which our function is defined.
Yeh right i understand for some unknown reason I added the y value to the x value and got myself confused. Cheers mate