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