Question

For what values of K does x2+kx+9=0

Answer 1

`k = 6`

Explanation:

`x {}^(2) + kx + 9 = 0`

here,

a = 1,

b = k

c = 9

now,

`D = b {}^(2) - 4ac`

`k {}^(2) - 4(1)(9) = 0 \\ k {}^(2) - 36 = 0 \\ k {}^(2) = 36 \\ k = 6`