Put quadratic functions in vertex form

Put quadratic functions in vertex form (A-SSE.B.3b$^\star$, F-IF.C.8a$^\star$).

In this section, students adapt the method of completing the square from solving quadratic equations to putting into vertex form the expressions that define quadratic functions. This connects with the work in the Quadratic Functions unit Section 7, where students saw the geometric meaning of vertex form but did not necessarily learn how to put a quadratic function in that form.