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8 - 8i
It is just 11+8i.
-5-7=-126i-8i=-2i-12-2i is your final answer
It's 8 sqrt(2) at an angle of 135° .
8i and -8i both satisfy this: (8i)² = (8²)(i²) = (64)(-1) = -64, and (-8i)² = (-8²)(i²) = (64)(-1) = -64