(3 − 4i)(5 + 2i) A. 15 − 8i B. 23 − 14i C. 15 − 8i2 D. 15 − 14i − 8i2

Question

(3 − 4i)(5 + 2i)

A. 15 − 8i
B. 23 − 14i
C. 15 − 8i2
D. 15 − 14i − 8i2

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Hồng Cúc 4 years 2021-08-12T16:12:24+00:00 1 Answers 14 views 0

Answers ( )

  1. danthu
    0
    2021-08-12T16:14:04+00:00
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    Answer:

    B.23-14i

    Step-by-step explanation:

    (3×5)+(3x2i)-(4ix5)-(4ix2i)

    15+6i-20i-8(-1)

    15+6i-20i+8

    23-14iฟ

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )