Answer:
18 + 40i
Explanation:
This is the product of two binomials:
Recall that (a + b)(c + d) = ac + ad +bc + bd; thus,
(6 - 4i)(-1 + 6i) = -6 + 36i + 4i + 24, or
= 18 + 40i
(Recall that i^2 = -1.)
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