Question

If the equation 9y2 + 6ky + 4 = 0 has equal roots, then the value of k

a) ±1

b) ±2

c) ±3

d) ±4​

Answer 1

Answer:

equation has equal roots D=0

D=b²-4ac = (6k)²- 4×9×4 = 36k²- 144 =0

36k²=144

k²= 144/36

k=12/6

k=2