Your answer should be positive 3 A.
Answer:
C. m = 6
Step-by-step explanation:
The quadratic equation has a single solution, x = -3.
(x - (-3))(x - (-3)) = 0
(x + 3)(x + 3) = 0
(x + 3)^2 = 0
x^2 + 6x + 9 = 0
x^2 + mx + n = 0
m = 6; n = 9
