X=(x-i)(x+i)

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Solution for X=(x-i)(x+i) equation: 


Simplifying
X = (x + -1i)(x + i)

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

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

Multiply (-1i + x) * (i + x)
X = (-1i * (i + x) + x(i + x))
X = ((i * -1i + x * -1i) + x(i + x))

Reorder the terms:
X = ((-1ix + -1i2) + x(i + x))
X = ((-1ix + -1i2) + x(i + x))
X = (-1ix + -1i2 + (i * x + x * x))
X = (-1ix + -1i2 + (ix + x2))

Reorder the terms:
X = (-1ix + ix + -1i2 + x2)

Combine like terms: -1ix + ix = 0
X = (0 + -1i2 + x2)
X = (-1i2 + x2)

Solving
X = -1i2 + x2

Solving for variable 'X'.

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

Simplifying
X = -1i2 + x2

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