Question

for what value of k , are roots of the equations 3x^2+2kkx+27=0 real and equal. ​

Answer 1

condition of quadratic equation if root is real and equal ,

D=0

b^2-4ac=0

(2k)^2-4*3*27=0

4k^2=4*81

k^2=81

k=+9,-9