Answer:
Step-by-step explanation:
Comment
That's an awful lot of points to give away. Ten or 15 should be enough.
Completing the square.
1. First of all you can find the minimum or maximum immediately.
2. Second it cuts out the need to use the givens (a, b, c) in the quadratic formula which can at times be very cumbersome.
3. It gives you the opportunity to estimate the x and y roots without calculating them. Estimating on a test is a very valuable asset.
