what is the distance between 5,4 and -1,1

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what is the distance between 5,4 and -1,1

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Hồng Cúc 3 years 2021-08-27T17:12:21+00:00 1 Answers 7 views 0

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  1. danthu
    0
    2021-08-27T17:14:20+00:00
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    Answer:

    3\sqrt{5}

    Step-by-step explanation:

    Calculate the distance d using the distance formula

    d = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }

    with (x₁, y₁ ) = (5, 4) and (x₂, y₂ ) = (- 1, 1)

    d = \sqrt{(-1-5)^2+(1-4)^2}

       = \sqrt{(-6)^2+(-3)^2}

       = \sqrt{36+9}

       = \sqrt{45}

       = 3\sqrt{5} ← exact value

       ≈ 6.71 ( to 2 dec. places )

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