If the point of complex number (a + I) 2 in the complex plane is on the negative half axis of Y axis, then the value of real number a is () A. 1B. -1C. 2D. -2

If the point of complex number (a + I) 2 in the complex plane is on the negative half axis of Y axis, then the value of real number a is () A. 1B. -1C. 2D. -2

If the corresponding point of (a + I) 2 = A2-1 + 2ai in the complex plane is on the negative half axis of the y-axis, then A2-1 = 0 and a < 0  a = - 1, then B is selected