p18johnsonj p18johnsonj

15-03-2018
Mathematics

contestada

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

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evgeniylevi evgeniylevi

15-03-2018

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

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