Students will learn how to use the quadratic formula to find the complex roots of a quadratic. Students should also learn how to plug in their solutions to verify them.
Solving quadratic equations: complex roots by Khan Academy
Solve quadratic equations: complex solutions by Khan Academy
Conclude by giving your students these challenges:
- Growing Garlic by NRICH
- Chippy's Journeys by NRICH
- Open Squares by NRICH
- 2001 AMC 8, Problem 1