EDIT: @2:27 we should have a checkmark beside minimum. Not maximum. Our video compositor made a mistake on this one and he has apologized and volunteered to do 50 jumping jacks to make up for this sinful mistake =P If the parabola is opening up, we are looking at a minimum. If the parabola is opening down, we are looking at a maximum. NERDSTUDY.COM for more detailed lessons! Find out about the what it means to write a quadratic equation in the vertex form!