Home/
Competitive Exams/
JEE Main & Advanced/
Mathematics/
Quadratic Equations and Inequalities/
Question 220009
JEE Mathematics · Medium

Quadratic Equations and Inequalities: Condition for equal roots MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Condition for equal rootsMediumQuestion 220009

Question

For kx² + 4x + 1 = 0 to have equal roots, the value of k is:
  1. A
    2
  2. B
    4
    Correct
  3. C
    6
  4. D
    8

Correct answer

4

Explanation

Equal roots: D = 0 → 16 − 4k = 0 → k = 4.

Review Quadratic Equations and Inequalities notesStart timed chapter practice