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Mathematics Worksheet

📐 Quadratic Equations

Chapter: Algebra I · Level ★★☆ · Time: 30 min
SCORE___ / 20
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After this worksheet you can
Solve quadratics by factoring.Solve by taking square roots.Understand the two roots.Recognise when there is no real solution.
📚 Quick Recap

A quadratic equation involves a variable raised to the second power — its graph is always a curved parabola, and it can have zero, one, or two real solutions.

🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4

1Solve x2 + 8x + 15 = 0:
2Solve x2 − 36 = 0:
3Solve x2 = 100:
4Solve x2 − 9x + 20 = 0:
y = x² − 4 crosses the x-axis at its roots x = ±2

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

5x2 − 36 = 0 gives x = .
6x2 = 100 gives x = .
7Solve x2 + 8x + 15 = 0 by factoring.
8Solve x2 − 36 = 0.
9Solve x2 = 100.

🚀 Section C · Challenge ● CHALLENGE 5

10Solve x2 − 9x + 20 = 0 by factoring.
💭 Reflection — the most useful thing I learned:
A ___/4   B ___/11   C ___/5   Total ___/20 Teacher's Signature Parent's Signature
✂ answer key — fold or cut before handing out

1-A   2-A   3-A   4-A  |  5 ±6   6 ±10   7 = x = −3 or x = −5   8 = x = 6 or x = −6   9 = x = 10 or x = −10  |  10 = x = 4 or x = 5

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