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### Course: Algebra 1 (Eureka Math/EngageNY) > Unit 4

Lesson 10: Topic B: Lessons 14-15: The quadratic formula- The quadratic formula
- Using the quadratic formula
- Worked example: quadratic formula
- Worked example: quadratic formula (example 2)
- Worked example: quadratic formula (negative coefficients)
- Quadratic formula
- Using the quadratic formula: number of solutions
- Number of solutions of quadratic equations
- Proof of the quadratic formula

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# Number of solutions of quadratic equations

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