samantharobinso1 samantharobinso1 24-04-2019 Mathematics contestada If f(x) = 3x2 + 6x + 12 and g(x) = x2 – 6x + 3, what is f(x) + g(x)? A. 2x^2 - 12x - 15 B. 4x^2 + 12x + 15 C. 4x^2 + 15 D. 2x^2 + 12x + 15