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