This is so confusing (8 + sqrt of -18) - (4 + 3 sqrt of 2i)
Last edited by mr fantastic; Sep 14th 2009 at 06:51 AM. Reason: Changed post title and removed extraneous o's from so.
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Originally Posted by tsmith This is soooooo confusing (8 + sqrt of -18) - (4 + 3 sqrt of 2i) Is it ? If so, note that Now simplify by combining the real and imaginary parts. Can you continue from here?
So the 3 sqrt 2i will cancel each other out, right? So the answer would be 4?
Originally Posted by tsmith So the 3 sqrt 2i will cancel each other out, right? So the answer would be 4? yes.
That is, assuming you meant and not . Not being able to tell is that "i" is inside or outside the square root is a good reason to always write "i" in front of square roots, not behind them.
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