Question

If the roots of a quadratic equation x2 - px + 4 = 0 are equal then p= ?
(A) 3
(B) 4
(C) 5
(D) 2​

Answer 1

Answer:

+or-4

Step-by-step explanation:

since the roots are equal

b^2-4ac=0

(-p) ^2-4*1*4=0

p^2-16=0

p=+or- 4