Question

The value(s) of k for which the quadratic equation
2x2 + kx +2 =0 has Equal root, is
(A)4 (B) +4 (C)4 (D)0​

Answer 1

Answer:

For equal roots, discriminant D of equation 2x2+kx+k=0, should be zero.

D=k2−4(2)(k)=0

k2−8k=0

k(k−8)=0

k=0,8