Question

If x² + 2kx + 4 = 0 has a root x = 1 then the value of k is​

Answer 1

Step-by-step explanation:

put value of x= 1

1 + 2k + 4 = 0

5+2k = 0

2k = -5

k = -5/2

Answer 2

  x² + 2kx + 4

= 1x1 + 2xkx1 + 4

= 1 + 2k + 4

= 5 + 2k

Now x² + 2kx + 4 = 0

     ∴ 5 + 2k = 0

     ∴ 2k = -5

     ∴ k = -5/2