Youtube videos by Julie Harland are organized at http://YourMathGal.com We do this problem: Find 2 numbers whose difference is 6 and whose product is as small as possible. This is done using a quadratic equation and the vertex point. Aligned to Common Core State Standard: HSA-CED.9 <br />For more great math videos visit: www.youtube.com/user/videosbyjulieharland/videos