Question

if -3 is a root of the equation x2 +kx -3 =0, find the value of k

Answer 1

Answer:

x² + kx - 3 = 0

given x = -3

(-3)² + k(-3) - 3 = 0

9 - 3k - 3 = 0

6 - 3k = 0

-3k = -6

k = -6/-3

k = 2