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use distributive property and multiply first (85-65i+68i-52i^2)-(85-65i+51i-39i^2) (85+3i-52i^2)-(85-14i-39i^2) the subtraction sign applies to each part so 85+3i-52i^2-85+14i+39i^2 then add like terms 17i-13i^2
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