Respuesta :
Since the axis of symmetry is the vertical line through the vertex, the line is given by
x=-B/(2A) = -B/(2*3) = 3/2
solving B
B=(3/2)*(-2*3)=-9
x=-B/(2A) = -B/(2*3) = 3/2
solving B
B=(3/2)*(-2*3)=-9