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Find the error and fix it (4 +6i)^2= (4)^2 + (6i)^2 = 16 + 36i^2 = 16+ (36)(-1) = -20
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1 vote
Find the error and fix it

(4 +6i)^2= (4)^2 + (6i)^2
= 16 + 36i^2
= 16+ (36)(-1)
= -20

User Bjarven
by
8.9k points

1 Answer

6 votes


(4 + 6i)^2 = 4^2 + 24i + 24i + (6i)^2\\= 4^2 + 48i + 36i^2\\= 16 + 48i + 36(-1)\\= 16 + 48i - 36\\= 48i - 20 = 4(12i - 5)

User Jermal
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