Question

What is the range of the function y = x2 +1 when the domain is {0, 2, 4}?

Answer 1

You find the range by plugging 0 ,2 and 4 into x^2 + 1.

for x = 0   y = 0 + 1 = 1
  x = 2, y =  2^2 + 1 =  5
  x = 4  y =  4^2 + 1 =  17

so the range is  {1, 5, 17}