Which of the following quadratic equations has no real solutions? 4x2 + 4x + 1 = 0

x2 + 3x - 5 = 0

2x2 - 4x + 3 = 0

x2 - 6x - 2 = 0

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.