Theory of quadratic equations

Written by Hassan Raza (Mathematics)

Class 10 · Mathematics · 9 questions

Name: ____________________ Date: ____________

The discriminant of ax² + bx + c = 0 is:
- A -b / 2a
- B 4ac
- C b² + 4ac
- D b² - 4ac
If the discriminant is negative, the roots are:
- A Complex
- B Real and distinct
- C Rational
- D Real and equal
The sum of the roots of x² - 7x + 12 = 0 is:
- A -7
- B -12
- C 7
- D 12
The product of the roots of x² - 7x + 12 = 0 is:
- A -12
- B 7
- C -7
- D 12
The discriminant of x² - 4x + 4 = 0 is:
- A 4
- B 16
- C -4
- D 0
The roots of x² + 1 = 0 are:
- A Real and equal
- B Complex
- C Real and distinct
- D Rational
If the discriminant is a positive perfect square, the roots are:
- A Rational and unequal
- B Complex
- C Irrational
- D Equal
For x² - 6x + 8 = 0 the sum of the roots is:
- A -6
- B 6
- C 8
- D -8
The discriminant of x² + 5x + 6 = 0 is:
- A 49
- B 1
- C 25
- D -1

Answer key

1. D, 2. A, 3. C, 4. D, 5. D, 6. B, 7. A, 8. B, 9. B