SOLUTION: find domain and range for y= x^2+3

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Question 156196: find domain and range for y= x^2+3
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
find domain and range for y=+x%5E2%2B3

The domain for every polynomial is (-infinity,infinity)

To find the range, solve for x:

y=+x%5E2%2B3

y-3=x%5E2

x%5E2=y-3

sqrt%28x%5E2%29= ±sqrt%28y-3%29

x= ±sqrt%28y-3%29

What is under a square root must be greater than
or equal to 0, so

y-3%3E=0

y%3E=3

In interval notation that is 

[3,infinity).

Edwin