Learning goals: Teacher Facing Choose an appropriate domain for a quadratic function representing a context and explain (orally) the reasoning why it was selected. Interpret (orally and in writing) the vertex of a graph and the zeros of a quadratic function in context. Write and graph equations to model economic situations characterized by quadratic functions. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg1.6 Introduction to Quadratic Functions, Algebra 1.