Question

For an equation X2+4X +k= 0 if roots are real and equal. what is the value of k ? A) 8 B)4 C)16 D) 2

Answer 1

Answer:

x^+4x+k=0

delta=b^-4ac=0

=4^-4×1×k=0

=16-4k=0

=16=4k=0

=16/4=k

=4=k

[•°•k=4]

hence option b is correct answer