Question

If x= 3 is one root of the quadratic equation x2 -2kx -6 = 0, then find the value of k. (1m) pls answer fast

Answer 1

Put x=3
3^2-2k3-6=0
9-6k-6=0
-6k= -9+6
-6k= -3
K=-3/-6
K=1/2