engineering mathematics MCQ #4339

For what value of p, the equation x² + px + 9 = 0 has equal roots?

engineering mathematics MCQ #4339

  1. Question 1

    Q1. For what value of p, the equation x² + px + 9 = 0 has equal roots?

    • A) ±6
    • B) 6
    • C) -6
    • D) ±3

    Answer: ±6

    Explanation: For equal roots, discriminant (b² - 4ac) = 0. So, p² - 4(1)(9) = 0, giving p = ±6.