x²<0Quadratic inequalities: math practice, grade 9

Practise “Quadratic inequalities” online for free. Five right answers in a row make the tasks harder, two mistakes in a row make them easier. Right answers earn coins for games.

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Example problems

These are only examples: the practice makes new tasks every time.

1. Solve the inequality.

   x² > 81

   Answer

   (−∞, −9) ∪ (9, +∞)

2. Solve the inequality.

   x² − 16x + 63 < 0

   Answer

   (7, 9)

3. Solve the inequality.

   x² − 6x + 5 > 0

   Answer

   (−∞, 1) ∪ (5, +∞)

4. Solve the inequality.

   x² + 13x + 40 > 0

   Answer

   (−∞, −8) ∪ (−5, +∞)

5. Solve the inequality.

   x² + 5x ≤ 36

   Answer

   [−9, 4]

6. Solve the inequality.

   x² + 4 > 0

   Answer

   (−∞, +∞)

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