Question

Answer fast its urgent

Answer 1

let b=-2k,a=k,c=6
for equal roots b^2-4ac=0
then,(-2k)^2-4× k×6=0
4k^2-24k=0
4k(k-6)=0
4 k=0= k=0( not possible because it will not satisfy quadratic equation)
k-6=0
k=6