12+0.75i$ appears to be escaping, attracted, or periodic in the Mandelbrot sequence, we need to iterate the function $f(z) = z^2 + c$ starting with $z_0 = 0$ and see what happens.
Let's calculate the first few terms of the sequence:
$z_0 = 0$
$z_1 = z_0^2 + c =
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