Question

18. The value of k for which the equation x - 4x + k=0 has equal roots is: -(a) 2
(b)-2
(c) 4
(d) none of these​

Answer 1

Answer:

c) 4

According to the question,

x² - 4x + k = 0

a = 1 , b = - 4 , c = k

b²- 4ac = 0

(-4)² - 4(1)(k) = 0

16 - 4k = 0

16 = 4k

k = 16/4

k = 4

hope it helps you :)