What is the value of the product (3 – 2i(3 + 2i?​

Question

What is the value of the product (3 – 2i(3 + 2i?​

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Linh Đan 5 months 2021-08-21T22:39:54+00:00 2 Answers 6 views 0

Answers ( )

    0
    2021-08-21T22:40:56+00:00

    Answer:

    13

    Step-by-step explanation:

    Assuming this is (3-2i)(3+2i)

    Use the FOIL method

    First:       3(3) = 9

    Outter:   3(2i) = 6i

    Inner:     -2i(3) = -6i

    Last:        -2i(2i) = -4i²

    Add all of them together:

        9 + 6i – 6i – 4i²

    =   9 – 4i²   =    9  – 4(-1)   =   9 + 4  =  13

    *NOTE that i² = -1

    0
    2021-08-21T22:41:04+00:00

    Answer:

    i is always positive

    Step-by-step explanation:

    if be multiply 3 by 3 and get 9, then you multiply -2i by 2i and get -4i squared

    9-4i^2 is now easy to solve unless we do now know the value of i, but since i is squared, i is always positive

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