how to solve sqrt(-8.3)sqrt(1 - i8)?

i try to solve it.. but got the wrong answer..

sqrt(-8.3)sqrt(1 - i8) = sqrt[(8.3i^2)(1 - 8i)]

= sqrt (8.3i^2 - 66.4i)

= 2.88i + 8.15

the answer should be.. 5.41 + i6.13

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- August 10th 2011, 10:08 PMnameckSimple Complex number
**how to solve sqrt(-8.3)sqrt(1 - i8)?**

i try to solve it.. but got the wrong answer..

sqrt(-8.3)sqrt(1 - i8) = sqrt[(8.3i^2)(1 - 8i)]

= sqrt (8.3i^2 - 66.4i)

= 2.88i + 8.15

the answer should be.. 5.41 + i6.13 - August 10th 2011, 11:33 PMCaptainBlackRe: Simple Complex number
- August 10th 2011, 11:38 PMnameckRe: Simple Complex number
sorry... typo... from my calculation.. it should be 2.88i - 66.4

i get it from sqrt (8.3i^2) and sqrt 66.4i)