This skill is used in: 

• solving quadratic inequalities - Book 2 p122
• proofs using completing the square - Book 2 p286

You will need:

Paper, pen/pencil, ruler, calculator

The first video (Sketching Quadratics - Inequalities) looks at sketching to solve a quadratic inequality.

The second video (Sketching Quadratics - Completing the Square) looks at sketching a quadratic using the technique of completing the square.