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OpenStudy (anonymous):
What is the product of (2 – i)(4 + i)
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OpenStudy (anonymous):
2-i=0 4+i=0 i=2 i=-4
OpenStudy (nubeer):
8 +2i-4i -i^2 8-2i +1 9-2i
hero (hero):
(2 – i)(4 + i) = 2(4 + i) -i(4 + i) = 8 + 2i - 4i + i^2 = 8 - 2i + 1 = 8 + 1 - 2i = 9 -2i
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