• ПОМОГИТЕ ПОЖАЛУЙСТА!
    Найдите x1 и x2 и все с решением

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Ответы 1

  • Ответ:

    Пошаговое объяснение:

    1.

    x² + 7x + 10 = 0

    D = 49 - 40 = 9

    x₁ = \frac{-7 + 3}{2} = -2

    x₂ = \frac{-7 - 3}{2} = -5

    2.

    x² - x - 20 = 0

    D = 1 + 80 = 81

    x₁ = \frac{1 + 9}{2} = 5

    x₂ = \frac{1 - 9}{2} = -4

    3.

    x² + 6x - 7 = 0

    D = 36 + 28 = 64

    x₁ = \frac{-6 + 8}{2} =  1

    x₂ = \frac{-6 - 8}{2} = -7

    4.

    x² + 11x + 24= 0

    D = 121 - 96 = 25

    x₁ = \frac{-11 + 5}{2} =  -3

    x₂ = \frac{-11 - 5}{2} =  -8

    5.

    x² + 17x + 70 = 0

    D = 289 - 280 = 9

    x₁ = \frac{-17 + 3}{2} =  -7

    x₂ = \frac{-17 - 3}{2} =  -10

    6.

    x² - 7x - 30 = 0

    D = 49 + 120 = 169

    x₁ = \frac{7 + 13}{2} =  10

    x₂ = \frac{7 - 13}{2} =  -3

    7.

    x² + 10x - 11 = 0

    D = 100 + 44 = 144

    x₁ = \frac{-10 + 12}{2} =  1

    x₂ = \frac{-10 - 12}{2} =  -11

    8.

    x² + x - 12 = 0

    D = 1 + 48 = 49

    x₁ = \frac{-1 + 7}{2} =  3

    x₂ = \frac{-1 - 7}{2} =  -4

    9.

    x² +11x + 28 = 0

    D =  121 - 112 = 9

    x₁ = \frac{-11 + 3}{2} =  -4

    x₂ = \frac{-11 - 3}{2} =  -7

    10.

    x² - 4x -21 = 0

    D = 16 +84 = 100

    x₁ = \frac{4 + 10}{2} =  7

    x₂ = \frac{4 - 10}{2} =  3

    11.

    x² + 4x + 3 = 0

    D = 16  - 12 = 4

    x₁ = \frac{-4 + 2}{2} =  -1

    x₂ = \frac{-4 - 2}{2} =  -3

    12.

    x² + 7x - 18 = 0

    D = 49 + 72 = 121

    x₁ = \frac{-7 + 11}{2} =  2

    x₂ = \frac{-7 - 11}{2} =  -9

    13.

    x² + 6x + 5 = 0

    D = 36 - 20 = 16

    x₁ = \frac{-6 + 4}{2} =  -1

    x₂ = \frac{-6 - 4}{2} =  -5

    14.

    x² - 9x + 14 = 0

    D = 81 - 56 = 25

    x₁ = \frac{9 + 5}{2} =  7

    x₂ = \frac{9 - 5}{2} =  2

    15.

    x² + 13x +42 = 0

    D = 169 - 168 = 1

    x₁ = \frac{-13 + 1}{2} =  -6

    x₂ = \frac{-13 - 1}{2} =  -7

    16.

    x² + 2x  -3 = 0

    D = 4  + 12 = 16

    x₁ = \frac{-2 + 4}{2} =  1

    x₂ = \frac{-2 - 4}{2} =  -3

    17.

    x² - x - 12 = 0

    D = 1 +48 = 49

    x₁ = \frac{1 + 7}{2} =  4

    x₂ = \frac{1 - 7}{2} =  3

    18.

    x² + 12x + 35 = 0

    D = 144 - 140 = 4

    x₁ = \frac{-12 + 2}{2} = -5

    x₂ = \frac{-12 - 2}{2} =  -7

    19.

    x² - 10x + 21 = 0

    D = 100 - 84 = 16

    x₁ = \frac{10 + 4}{2} =  7

    x₂ = \frac{10 - 4}{2} =  3

    20.

    x² - x - 30 = 0

    D = 1 + 120 = 121

    x₁ = \frac{1 + 11}{2} =  6

    x₂ = \frac{1 - 11}{2} =  5

    21.

    x² - 9x + 20 = 0

    D = 81 - 80 = 161

    x₁ = \frac{9 + 13}{2} =  11

    x₂ = \frac{9 - 13}{2} =  -2

    22.

    x² - 11x + 24 = 0

    D = 121 -96 = 25

    x₁ = \frac{11 + 5}{2} =  8

    x₂ = \frac{11 - 5}{2} =  3

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