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Mathematics 19 Online
OpenStudy (anonymous):

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

OpenStudy (kc_kennylau):

Distribute it first

OpenStudy (anonymous):

-5i-15i

OpenStudy (kc_kennylau):

Don't forget that i^2=-1

OpenStudy (kc_kennylau):

No it's not -15i at the end

OpenStudy (kc_kennylau):

It's not -15i at the end

OpenStudy (anonymous):

a)-15-5i b)-15+5i c)15-5i d)15+5i

OpenStudy (kc_kennylau):

God follow my instruction

OpenStudy (kc_kennylau):

Distribute it again, you distributed it wrongly

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