Learning goals: Teacher Facing Explain (orally and in writing) how an expression in vertex form can show whether the vertex of a graph represents the maximum or minimum of a quadratic function. Rewrite a quadratic expression in vertex form to identify the maximum or minimum value of the function the expression defines. Use the structure of a quadratic expression in vertex form to determine whether the vertex of its graph represents the maximum or minimum of the quadratic function. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg1.7 Quadratic Equations, Algebra 1.