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I need help with this problem 2sqrt (-4)-94

Mathematics
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4i-94 which i = sqrt(-1)
I do not understand how to work the problem out at all .
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|dw:1345597202428:dw|
Where did the sprt(-1) come from ?
it's just assignment, we guess it is equal to variable "i" kind of abstraction, mathematicians use
I still do not understand
Write the following expressions in standard form.
you can read it in wikipedia: http://en.wikipedia.org/wiki/Imaginary_number
@Yazzy2041 \[-1 = i^2\] Thats what he's saying
I do not understand the breakdown this is my first time doing this @hawkfalcon
It's okay:) Thanks for fanning me:P
\[2\sqrt (-4)-94\] \[2 i \sqrt (4)-94\] \[2i2-94\] How far do you need to go?
\[4i - 94\]
thanks
No problem, make sense? It it has a negative value in the radical, you make it imaginary:P

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