This one-page pdf provides helpful examples for solving for features of a quadratic.
Hints include: Using factoring, completing the square, and quadratic formula to find roots. Additionally, examples are given on how to find the vertex by completing the square and using -b/2a to find the vertex.
Helpful explanations on when to use each method are provided, as well as the same example for each method so students see the same answer is reached regardless of strategy. My students LOVE this sheet - some have even laminated it. I hope it can help your students as well, good luck!