How do you determine the domain and range of a function when given a graph?

1 Answer
Mar 26, 2018

Answer:

You have to look at the function and notice any special features and see values would not exist for the function.

Explanation:

Example: #sqrtx# you would know that x can't be negative as you can't have a negative root so domain would be #[0,oo)#

Example: #x^2+1# you would know that the parabola has been shifted upwards so y can't be any value below one Range: #[1,oo)#

Example: #1/x# you would know that the hyperbola can't have 0 in the denominator so values of x apart from 0 would be fine #(-oo,0)U(0,oo)#