Which function's graph has axis of symmetry x = 2?

y = 3x² + 12x+6

y = 3x2 - 6x+12

y=-3x2 - 12x+6

y=-3x2 + 12x+6

y=-3x2 - 12x+6, x = - (-12) / 2*3 = 2 this one has axis of symmetry x = 2

Step-by-step explanation:

y = 3x² + 12x+6 : x = - 12/6 = - 2

y = 3x2 - 6x+12, x = - (-6) / 2*3 = - 1

y=-3x2 - 12x+6, x = - (-12) / 2*3 = 2 this one

y=-3x2 + 12x+6, x = - 12/2*3 = - 2