range y ∈ {7, 223, 62, - 2 }
to obtain the range from the given values of x in the domain, substitute x into f(x)
f(2) = 2² + 2(2) - 1 = 4 + 4 - 1 = 7
f(14) = 14² + 2(14) - 1 = 196 + 28 - 1 = 223
f(7) = 7² +2(7) - 1 = 49 + 14 - 1 = 62
f(- 1) = (-1)² + 2(- 1) - 1 = 1 - 2 - 1 = - 2
