(3i-5)(6i+3)
(3i - 5)(6i + 3) Apply complex arithmetic rule: (a+bi)(c+di)=(ac-bd)+(ad+bc)i; a= -5, b = 3, c = 3, d = 6 =(-5 * 3 - 3 * 6) + (-5 * 6 + 3 * 3)i; = -33 + (-21)i; = -33 -21i
Question
Updated 9/4/2017 1:51:53 PM
Rating
3
(3i - 5)(6i + 3)

= 18i^2 + 9i - 30i - 15;

= 18i^2 - 21i - 15
This answer has been flagged as incorrect.
Flagged by jeifunk [9/4/2017 12:36:37 PM]
3
[Deleted]
Deleted by alfred123 [9/4/2017 1:50:54 PM]
3
[Deleted]
Deleted by alfred123 [9/4/2017 1:51:46 PM]
3
(3i - 5)(6i + 3)

a= -5, b = 3, c = 3, d = 6

=(-5 * 3 - 3 * 6) + (-5 * 6 + 3 * 3)i;

= -33 + (-21)i;

= -33 -21i

Confirmed by jeifunk [9/4/2017 2:12:56 PM]

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