JAMB Mathematics 2021 Objective — Question 5

Question 5 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

5. What should be the value of p so that the roots of the equation 4x² + px + 9 = 0 will be equal? (a) ±4 (b) ±6 (c) ±12 (d) ±18

A. ±4
B. ±6
C. ±12Correct
D. ±18

Explanation

For a quadratic ax²+bx+c=0 to have equal roots, b² = 4ac. Here p² = 4(4)(9) = 144, so p = ±√144 = ±12.

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