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Mathematics 21 Online
OpenStudy (anonymous):

The product of (-2+6i) and (3+4i) is?

OpenStudy (anonymous):

do it !

zepdrix (zepdrix):

\[\Large\rm (-2+6\mathcal i)(3+4\mathcal i)\]Soooo... FOIL it out, yes?\[\Large\rm =(-2)3+(-2)4\mathcal i+(6\mathcal i)3+(6\mathcal i)4 \mathcal i\]

OpenStudy (anonymous):

also, adding, that i^2 = -1

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