Chapter 4 - Quadratic Functions - 4.2 Graphing Quadratics in Vertex Form - 4.2 Exercises - Page 320: 55

Domain: All real numbers. Range: $[2,\infty)$

Given $$ f(x) = 0.4x^2+2.$$ The parabola opens upward as we can see from the graph. Its vertex gives the minimum point. The domain and range are given by: Domain: All real numbers. Range: $[2,\infty)$.