This is in the form of $(a-bi)(a+bi)$, which is a special product known as the difference of squares, where $a = -2$ and $b = 6$.
The formula for the difference of squares is $(x-y)(x+y) = x^2 - y^2$.
In this case, $x = -2$ and $y = 6i$.
Step 2: Apply the
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