Question

for what value of k , the quadratic equation , has equal roots ? x^2 - kx+4=0
(a) k =+1
(b) k =0,1
(c) k = 2,3
(d) k= +4

plz give me answer fast ​

Answer 1

Answer:

D=b^2-4ac

=(-k^2)-4(1)(4)

=k^2-16

given equation has equal roots so

D=0

k^2-16=0

k^2=16

k=√16

k=4

hence proved