This equation is possible. Process:
x¹,²=[-14±sqrt(14²-440)]/2
x¹,²=[-14±sqrt(196.000000-0.000000)]/2
x¹,²=[-14±14]/2
x¹=[0.000000]/4
x²=[-28.000000]/4
x¹=0.000000
x²=-3.500000