Question

3.
If the roots of the quadratic equation x2 + 6x + k = 0) are equal, then the value
of k'is :
A. 9
B. -9
C. 8
D. 5​

Answer 1

Answer:

x2 + 6x + k = 0

b²-4ac=0

(6)²-4*1*k=0

36-4k=0

-4k=-36

k=36/4

k=9

(-)symbol will be canceled that's why answer will become k=9