I need help with a function problem:
Find the range of the function f(x)=√x+5+√20+x.
As small as x can be is -5
So....the bottom of the range = sqrt ( -5 + 5) + sqrt (20 + -5) = sqrt (15)
And the function continues to infinity no matter how large the value of x
Range = [ sqrt (15) , inf)
+818 
