Respuesta :

Neuron
If you would like to write (-3 + √-9)^2 in a standard form a + i * b, you can do this using the following steps:

(-3 + √-9)^2 = (-3)^2 - 2 * 3 * √-9 + (√-9)^2 = 9 - 6 * 3 * i - 9 = 0 - 18 * i = -18 * i

The correct result would be -18 * i.