Question

For what value of k the equation 9x2+6kx+4=0 has equal roots​

Answer 1

k = 2

Step-by-step explanation:

If equation has equal roots then,

Discriminant (D) = 0

D = b2 - 4ac 0

==: 9x? + 6kx + 4 = 0

a = 9, b = 6k ,c = 4

D = 36k? - 144 0

(6k)? - (12)? = 0

(6k - 12) (6k + 12) = 0 k = 2