Question

for what value of k are the roots of the quadratic equation 3x^2+2kx+27=0 real and equal

Answer 1

Discriminant= 0

So b^2-4ac =0
4k^2 -4×3×27 =0
4k^2 -324= 0
4k^2 = 324
k^2 = 81

So the value of k is 9.