Question

3.If the equation x² - 4x + k = 0
has equal roots, then the value of k is
a) 2 b)-2 c)4 d)-4​

Answer 1

equal roots means that the discriminant should be equal to 0,

so,

Answer 2

x² - 4x + k = 0

if the roots are equal.

b² -4ac=0

16-4×1×k= 0

-4k-16

k=4.