In this lesson, you learned how to:
- Identify common errors when using the quadratic formula.
- Describe some ways to tell if a number is a solution to a quadratic equation.
Here are the activities that helped you reach those goals:
- 9.7.1: Evaluating Variable Expressions
- In this activity, you evaluated expressions using substitution.
- 9.7.2: Common Calculation Errors When Using the Quadratic Formula
- In this activity, you explored how four different quadratic equations were solved by the quadratic formula. With each one, you identified the error that occurred and explained why it was an incorrect step.
- 9.7.2: Self Check
- 9.7.3: Additional Resources
- 9.7.3: Different Methods of Checking Solutions of Quadratic Equations
- In this activity, you looked at an application of quadratic equations and used the quadratic formula to prove your answer, and justify if you agreed with the answers given by a sample student.
- 9.7.3: Self Check
- 9.7.3: Additional Resources
- 9.7.4: Practice Spotting Calculation Errors
- In this activity, you examined an attempt to solve a quadratic equation using the quadratic formula and identified and explained all errors in the solution.
After these activities, you completed the following practice:
- 9.7.5: Practice
Checking In
On a scale of 1 to 5, how confident do you feel about the learning goals of this lesson?
Nice reflection! You learn more when you take the time to reflect on your thinking.