f(x)=(x-3i)(x+3i)

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Solution for f(x)=(x-3i)(x+3i) equation:


Simplifying
f(x) = (x + -3i)(x + 3i)

Multiply f * x
fx = (x + -3i)(x + 3i)

Reorder the terms:
fx = (-3i + x)(x + 3i)

Reorder the terms:
fx = (-3i + x)(3i + x)

Multiply (-3i + x) * (3i + x)
fx = (-3i * (3i + x) + x(3i + x))
fx = ((3i * -3i + x * -3i) + x(3i + x))

Reorder the terms:
fx = ((-3ix + -9i2) + x(3i + x))
fx = ((-3ix + -9i2) + x(3i + x))
fx = (-3ix + -9i2 + (3i * x + x * x))
fx = (-3ix + -9i2 + (3ix + x2))

Reorder the terms:
fx = (-3ix + 3ix + -9i2 + x2)

Combine like terms: -3ix + 3ix = 0
fx = (0 + -9i2 + x2)
fx = (-9i2 + x2)

Solving
fx = -9i2 + x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -9i2x-1 + x

Simplifying
f = -9i2x-1 + x

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