To simplify (8-6i)(-4-4i) open the brackets and multiply the terms

(8-6i)(-4-4i)

=> 8*-4 - 8*4i - 6i*(-4) - 6i*(-4i)

=> -32 - 32i + 24i + 24i^2

=> -32 - 8i - 24

=> -56 - 8i

**The required product of is -56 - 8i**

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