Class 10 · Mathematics · Mathematics

4. Quadratic Equations

Try question 1

The discriminant of 2x² − 4x + 3 = 0 is

Tap an answer to check.

Answer and explanation

Answer: B. −8

b² − 4ac = 16 − 24 = −8.

Open this question →

Try question 2

If the discriminant of a quadratic equation is zero, its roots are

Tap an answer to check.

Answer and explanation

Answer: C. real and equal

When b² − 4ac = 0, both roots equal −b/2a.

Open this question →

Try question 3

Which of these is a quadratic equation?

Tap an answer to check.

Answer and explanation

Answer: C. x² − 4x + 1 = 0

A quadratic equation has degree 2: ax² + bx + c = 0 with a ≠ 0.

Open this question →