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OpenStudy (anonymous):
please simplify step by step (8+i)(2+7i)
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OpenStudy (anonymous):
we just cross multiply. to get 16+56i+2i+7i^2. then we just combine like terms to get 16+58i+7i^2
OpenStudy (anonymous):
i thought so too but its wrong..
OpenStudy (anonymous):
the answer is 56i+9 but idk how.
OpenStudy (anonymous):
no that answer is wrong.
OpenStudy (anonymous):
i checked on mathway
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OpenStudy (earthcitizen):
\[j ^{2}=-1 \therefore (8+j)(2+j7) = 16+j56+j2-7 = j58-9\]
OpenStudy (anonymous):
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