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5i+-i? im so lost

 Nov 14, 2016
edited by Guest  Nov 14, 2016
edited by Guest  Nov 14, 2016
edited by Guest  Nov 14, 2016
 #1
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Is that the whole problem?

 Nov 14, 2016
 #2
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5i+-i = 5i - i = 4i

 Nov 14, 2016

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