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

asked Jan 7, 2021 147k views

1 vote

Find the error and fix it

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

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6 votes

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

Jermal answered Jan 12, 2021

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