Posted by raven 31791 on Wednesday, March 7, 2007 at 11:55am.
The sq root of -4 (3-sq root of -9)
Again the i's are in italics. I would think that c and d could be eliminated because the answer is suppose to be in the form a + bi but they could be trting to trick you.
I'm not quite sure what your problem is, so I'm going to assume it's something like the following:
√-4(3 - √-9)
i = √-1
i^2 = -1
Note: I'm using ^2 to mean squared.
√-4 = 2i
√-9 = 3i
Now we have: 2i(3 - 3i)
6i - 6i^2 =
6i - 6(-1) =
6i + 6
6 + 6i
I hope this helps and is what you were asking.
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