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Sections

Quadratic Equations

Pick a section. You read the idea first, then answer questions on it.

1. When the unknown is squared1 ideaRead
2. Before you start1 ideaRead
3. Standard form of a quadratic equation1 ideaRead
4. A root satisfies the equation1 ideaRead
5. Simplify first, then check the form1 ideaRead
6. Turning a situation into a quadratic1 ideaRead
7. Solving by factorisation1 ideaRead
8. When both factors are the same1 ideaRead
9. The quadratic formula1 ideaRead
10. The discriminant1 ideaRead
11. What the discriminant’s sign tells you1 ideaRead
12. A negative constant term makes the discriminant larger1 ideaRead
13. Check the discriminant before choosing a method1 ideaRead
14. Worked: is it quadratic?1 ideaRead
15. Worked: a garden’s area as a quadratic1 ideaRead
16. Worked: factorising to find the roots1 ideaRead
17. Worked: solving with the formula1 ideaRead
18. Worked: reading the nature of roots1 ideaRead
19. Worked: checking the discriminant before factoring1 ideaRead
20. Recap1 ideaRead
21. Where you will meet this1 ideaRead
22. Practice set: Exercise 4.11 ideaRead
23. Practice set: Exercise 4.21 ideaRead
24. Practice set: Exercise 4.31 ideaRead