[tex](9 + 7i)(6 + i) \\ = 54 + 9i + 42i + 7 {i}^{2} \\ = 54 + 51i - 7 \\ = 47 + 51i[/tex]
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Answer:
47+51i
Step-by-step explanation:
(9+7i)(6+i)
54+42i+9i+7i^2 where i^2=-1
54+42i+9i+7(-1)
54+51i-7
54-7+51i
47+51i
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