Question 3980
1. y=-3x-1
domain is xeR
range is yeR


2. y=-3x^2+1
domain is xeR
range is yeR, y<=1


3. y=5
domain is xeR
range is y=5


4. y=x^3-1
domain is xeR
range is yeR


5. y={{{sqrt(x)}}}
domain is xeR, x>=0
range is yeR, y>=0


6. y=(x+1)^(1/2)
domain is xeR, x>=-1
range is yeR, y>=0


7. y=(x-1)^(1/2)
domain is xeR, x>=1
range is yeR, y>0


8. y=(x^2+9)^(1/2)
domain is xeR
range is yeR, y>=3


9. y=(x-6)^(1/3)
domain is xeR
range is yeR


10. y=6/(x-3)
domain is xeR, x not 3
range is yeR, y not 0


I have zipped through these - i may have overlooked something somewhere, but i think it is all correct.


The secret with domains and ranges is to know what a graph looks like, as tat tells you the answers.


jon.