Answer
$-30-18i$
Work Step by Step
RECALL:
(1) $a(b-c) = ac - bc$
(2) $i^2=-1$
Use rule (1) above to obtain:
$=-6i(3) - (-6i)(5i)
\\=-18i - (-30i^2)
\\=-18i+30i^2$
Use rule (2) above to obtain:
$=-18i +30(-1)
\\=-18i + (-30)
\\=-30-18i$
