SOLUTION: for our math homework we are supposed to find the domain of the functions, but I am really confused.... would you be able to walk me through the steps of finding the domain of this

Algebra ->  Functions -> SOLUTION: for our math homework we are supposed to find the domain of the functions, but I am really confused.... would you be able to walk me through the steps of finding the domain of this      Log On


   

Question 448637: for our math homework we are supposed to find the domain of the functions, but I am really confused.... would you be able to walk me through the steps of finding the domain of this problem? y=-5 times the square root of x
Thanks,
GB

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
the "domain" specifies all the values that x can take for the given function:
-5 times the square root of x
or
f%28x%29+=+-5%2Asqrt%28x%29
In this case, you just don't want the value under the radical to be negative (otherwise the result is an imaginary number).
So, the domain is
all real numbers equal to or greater than zero
OR
[0, +oo)
where
+oo is positive infinity