⌒Quadratic function: math practice, grade 9

Practise “Quadratic function” 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. y = x² + 4x + 3
   x = −1
   y = ?

   Answer

   0

2. Find the x-coordinate of the parabola’s vertex.

   y = x² + 8x + 13

   Answer

   −4

3. Find the vertex of the parabola.

   y = x² + 6x + 17

   Answer

   (−3, 8)

4. Find the vertex of the parabola.

   y = x² − 8x + 8

   Answer

   (4, −8)

5. Find the smallest value of the function.

   y = x² + 10x + 22

   Answer

   −3

6. Find the vertex of the parabola.

   y = 2(x − 1)² + 2

   Answer

   (1, 2)

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