Chapter 4 Quadratic Functions and Factoring - 4.2 Graph Quadratic Function in Vertex or Intercept Form - 4.2 Exercises - Skill Practice - Page 249: 29

$$y=x^2-6x+15$$

We are asked to put this equation in standard form. Thus, we first use the FOIL method. Next, we simplify until the equation is put in the form $y=ax^2+bx+c$. Doing this, we obtain: $$y=(x-3)(x-3)+6 \\y=x^2-6x+9+6 \\ y=x^2-6x+15$$