Question

if x is = -12 is a solution of quadratic equation 3x² + 2kx + 3= 0, find the value of k​

Answer 1

Answer:

15 / 4

Step-by-step explanation:

3x² + 2kx + 3= 0

Substituting x = -1/2,

3 (-1/2)^2 + 2(k)(-1/2) + 3 = 0

3 * (1/4) - k  + 3 = 0

(3 / 4) + (3 / 1) = k

(3 + 12 ) / 4 = k

15 / 4 = l