Which equation could be solved using the graph above?
Ax^2+4x+3=0
Bx^2-4x+3=0
Cx^2-6x+9=0
Dx^2-1=0
Ax^2+4x+3=0
Bx^2-4x+3=0
Cx^2-6x+9=0
Dx^2-1=0