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Mathematics 8 Online
OpenStudy (anonymous):

Simplify: -5/2+3i

terenzreignz (terenzreignz):

I'm assuming you mean this... \[\Large \frac{-5}{2+3\color{green}i}\] ?

OpenStudy (anonymous):

\[\frac{ -5 }{ 2 +3i } = \frac{ -5(2-3i) }{( 2+3i)(2-3i) }=\frac{ -10+15i }{ 4-6i+6i-9i ^{2} }=\frac{ -10+15i }{ 4-9i ^{2} }=\frac{ -10+15i }{ 4-9(-1) }=\frac{ -10+15i }{ 4+9 }\] \[\frac{ -10+15i }{ 13 }=\frac{ -10 }{ 13} + \frac{ 15i }{ 13 }=-0.76923+1.5385i\]

OpenStudy (anonymous):

I'm not sure if you can understand that but that is how it's done

OpenStudy (anonymous):

Yes it makes sense to me. Thank you

OpenStudy (anonymous):

I deserve a medal lol

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