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

User Deekron
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3 votes

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

i*i = -1 as you know.
User Sabtharishi
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