The idea
Three methods for one job. Factorising is fastest when it works, the formula always works, and completing the square is the one that explains why the formula is what it is.
Lesson
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Questions (5)
| Question | Type | Difficulty | Drift | Accuracy |
|---|---|---|---|---|
| Factorise: x² + 7x + 12 | mcq | Easy -0.80 | — | — (0) |
| One solution of x² − 5x + 6 = 0 is x = 2. What is the other? | numeric | Moderate 0.10 | — | — (0) |
| How many real solutions does 2x² + 3x + 5 = 0 have? | mcq | Hard 0.70 | — | — (0) |
| Solve x² − 6x + 2 = 0 by completing the square. Give the larger root to 3 decimal places. | numeric | Hard 1.10 | — | — (0) |
| A rectangular garden has a perimeter of 40 m and an area of 96 m². Find its dimensions, and explain why the pr… | short | Very hard 1.50 | — | — (0) |