Show all work to multiply (2+√-25)(4-√-100)

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Show all work to multiply (2+√-25)(4-√-100)

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Ben Gia 3 years 2021-08-14T04:32:34+00:00 1 Answers 27 views 0

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  1. huyenthanh
    0
    2021-08-14T04:34:20+00:00
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    Answer:

    -42

    Step-by-step explanation:

    given the expression;

    (2+√-25)(4-√-100)

    Note that √-25 = √-1 * √25

    √-100 = √-1 * √100

    According to complex number,  √-1 = i

    √-25 = 5i

    √-100 = 10i

    The expression becomes

    (2+5i)(4-10i)

    Open the parentehsis;

    = 2(4)-20i+20i-50i²

    =  8-50i²

    Since i² = -1

    The expression becomes;

    8-50i² = 8-50(-1)²

    8-50i² = 8-50 = -42

    Hence the product of the expression is -42

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