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What is the standard form of (1 + 7i)(3 − i)?

What is the standard form of (1 + 7i)(3 − i)?
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What is the standard form of (1 + 7i)(3 − i)?

User Cursa
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1 Answer

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Consider this option:
1. if the standard form is z=x+iy, then
2. (1+7i)(3-i)=1*3-1*i+21i-7i*i=3-i+21i+7=10+20i

answer: 10+20i
User Jesse Gumpo
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