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}