belalsabree belalsabree
  • 11-05-2017
  • Mathematics
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Write the expression -5i(1 + 3i) as a complex number in standard form.

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tonb
tonb tonb
  • 11-05-2017
[tex]-5i(1 + 3i) = -5i -15i^2 = 15-5i[/tex]

i*i = -1 as you know.
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