y=(x+1)(x-1-2i)

Solution for y=(x+1)(x-1-2i) equation:

Simplifying
y = (x + 1)(x + -1 + -2i)

Reorder the terms:
y = (1 + x)(x + -1 + -2i)

Reorder the terms:
y = (1 + x)(-1 + -2i + x)

Multiply (1 + x) * (-1 + -2i + x)
y = (1(-1 + -2i + x) + x(-1 + -2i + x))
y = ((-1 * 1 + -2i * 1 + x * 1) + x(-1 + -2i + x))
y = ((-1 + -2i + 1x) + x(-1 + -2i + x))
y = (-1 + -2i + 1x + (-1 * x + -2i * x + x * x))

Reorder the terms:
y = (-1 + -2i + 1x + (-2ix + -1x + x2))
y = (-1 + -2i + 1x + (-2ix + -1x + x2))

Reorder the terms:
y = (-1 + -2i + -2ix + 1x + -1x + x2)

Combine like terms: 1x + -1x = 0
y = (-1 + -2i + -2ix + 0 + x2)
y = (-1 + -2i + -2ix + x2)

Solving
y = -1 + -2i + -2ix + x2

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Simplifying
y = -1 + -2i + -2ix + x2