For a quadratic equation, ax2 + bx + c = 0, D = b2 – 4ac If D = 0, roots are real and equal ⇒ kx2 – 2√5kx + 10 = 0 ⇒ D = 4 × 5k2 – 4 × k × 10 = 0 ⇒ k2 = 2k ⇒ k = 2

Q. 124.7( 7 Votes )

For what value of

Class 10th

Answer :

For a quadratic equation, ax² + bx + c = 0,

D = b² – 4ac

If D = 0, roots are real and equal

⇒ kx² – 2√5kx + 10 = 0

⇒ D = 4 × 5k² – 4 × k × 10 = 0

⇒ k² = 2k

⇒ k = 2

Rate this question :

How useful is this solution?

We strive to provide quality solutions. Please rate us to serve you better.

Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts

Dedicated counsellor for each student

24X7 Doubt Resolution

Daily Report Card

Detailed Performance Evaluation

view all courses