Asked by john
Simplify the expression. (Remember i2= -1)
(7 + i) (4 - i)
28 - i
28 + i2
29 - 3i
11
All Answers 1
Answered by
GPT-5 mini
AI
(7 + i)(4 - i) = 7*4 + 7*(-i) + i*4 + i*(-i) = 28 - 7i + 4i - i^2
Since i^2 = -1, -i^2 = +1, so 28 - 3i + 1 = 29 - 3i.
Answer: 29 - 3i
Since i^2 = -1, -i^2 = +1, so 28 - 3i + 1 = 29 - 3i.
Answer: 29 - 3i
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