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Mathematics 11 Online
OpenStudy (anonymous):

Write the expression -5i(1 + 3i) as a complex number in standard form.

sam (.sam.):

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OpenStudy (anonymous):

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OpenStudy (anonymous):

WOuld it be -15 + 5i?

OpenStudy (anonymous):

i mean -15-5i

sam (.sam.):

i^2 is -1

OpenStudy (anonymous):

I'm confused... what's the answer..

sam (.sam.):

-5i(1 + 3i) -5i-15i^2 So when i^2=-1 -5i+15 15-5i

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