tìm x: (3-x)^2 + 1/2x(2x^2 -6x-4)=4

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tìm x: (3-x)^2 + 1/2x(2x^2 -6x-4)=4

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Philomena 5 years 2020-11-02T13:14:05+00:00 2 Answers 90 views 0

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  1. Vodka
    0
    2020-11-02T13:15:14+00:00
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    `(3-x)^2 + 1/2x(2x^2 -6x-4)=4`

    `⇔ 9-6x+x^2-x^3-3x^2-2x=4`

    `⇔ x^3+2x^2+8x-5=0`

    `⇔ x \approx 0,53`

  2. Philomena
    0
    2020-11-02T13:15:38+00:00
    Reply

    Đáp án:

     

    Giải thích các bước giải:

    `(3-x)^2 + 1/2x(2x^2 -6x-4)=4`

    `⇔ 9-6x+x^2-x^3-3x^2-2x=4`

    `⇔ x^3+2x^2+8x-5=0`

    `⇔ x \approx 0,53`

    Vậy `S={0,53}`

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