Номер 13, страница 12 - гдз по алгебре 9 класс учебник Солтан, Солтан

Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019

Авторы: Солтан Г. Н., Солтан А. Е., Жумадилова А. Ж.

Тип: Учебник

Издательство: Кокшетау

Год издания: 2019 - 2026

ISBN: 978-601-317-424-2

Рекомендовано Министерством образования и науки Республики Казахстан

Повторение курса алгебры 8 класса. Упражнения - номер 13, страница 12.

App\Models\Task {#1030 // resources/views/models/task/default.blade.php
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            0 => "*"
          ]
        }
        1 => App\Models\Branch {#1102
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
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            "created_at" => "2026-04-10 13:58:26"
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            "field_page_start" => "11"
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              #items: array:1 [
                0 => App\Models\Book {#1105
                  #connection: "mysql"
                  #table: "books"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
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                    "id" => 4298
                    "created_at" => "2026-04-10 13:58:26"
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                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1116 …2}
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                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1127 …2}
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                    "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ"
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                    "field_cover" => array:1 [ …1]
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                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1132 …2}
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                0 => App\Models\Branch {#1134
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1135 …2}
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            "id" => 1107637
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      ]
      #escapeWhenCastingToString: false
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    "content" => Illuminate\Database\Eloquent\Collection {#1141
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            "created_at" => "2026-04-10 13:58:26"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1159
              #items: array:1 [
                0 => App\Models\Edition {#1151
                  #connection: "mysql"
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                  #attributes: array:21 [
                    "id" => 4953
                    "created_at" => "2026-04-10 13:58:26"
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                    "title" => "Условие"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1153 …2}
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              ]
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            }
            "task" => array:2 [
              "refs" => "1107703"
              "type" => "task"
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            "text" => "<p><strong>13.</strong> Один корень трехчлена $x^2 + bx + 35$ равен $-7$. Найдите другой его корень, коэффициент $b$ и разложите трехчлен на множители.</p>"
            "img" => array:1 [
              0 => array:5 [
                "name" => "13-1.jpg"
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                "width" => "1530"
                "height" => 199
                "path" => "/media/algebra_09/soltan-u19/0-1/13-1.webp?ts=1752834042"
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        1 => App\Models\Element {#1157
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                    "title" => "Решение 2 (rus)"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1169 …2}
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            "text" => "<p>Дан квадратный трехчлен $x^2 + bx + 35$. По условию, один из его корней равен $x_1 = -7$. Корень трехчлена – это такое значение переменной $x$, при котором значение трехчлена обращается в ноль. Следовательно, корни трехчлена являются корнями квадратного уравнения $x^2 + bx + 35 = 0$.</p><p>Для решения задачи удобно использовать теорему Виета. Для приведенного квадратного уравнения вида $x^2 + px + q = 0$ с корнями $x_1$ и $x_2$ выполняются следующие соотношения:<br>$x_1 + x_2 = -p$<br>$x_1 \cdot x_2 = q$</p><p>В нашем случае уравнение имеет вид $x^2 + bx + 35 = 0$, поэтому коэффициенты $p=b$ и $q=35$.</p><p><strong>Найдите другой его корень</strong><br>Воспользуемся формулой для произведения корней: $x_1 \cdot x_2 = q$.<br>Подставим известные значения $x_1 = -7$ и $q = 35$:<br>$(-7) \cdot x_2 = 35$<br>Чтобы найти $x_2$, разделим обе части уравнения на -7:<br>$x_2 = \frac{35}{-7}$<br>$x_2 = -5$<br>Ответ: -5.</p><p><strong>коэффициент b</strong><br>Теперь воспользуемся формулой для суммы корней: $x_1 + x_2 = -p$.<br>Подставим известные корни $x_1 = -7$ и $x_2 = -5$, а также $p = b$:<br>$(-7) + (-5) = -b$<br>$-12 = -b$<br>$b = 12$<br>Ответ: 12.</p><p><strong>разложите трехчлен на множители</strong><br>Общая формула для разложения квадратного трехчлена $ax^2 + Bx + C$ на множители при известных корнях $x_1$ и $x_2$ выглядит так: $a(x - x_1)(x - x_2)$.<br>Наш трехчлен, с учетом найденного $b=12$, имеет вид $x^2 + 12x + 35$. Старший коэффициент $a=1$. Корни $x_1 = -7$ и $x_2 = -5$.<br>Подставим эти значения в формулу разложения:<br>$1 \cdot (x - (-7))(x - (-5))$<br>Это выражение упрощается до:<br>$(x + 7)(x + 5)$<br>Для проверки можно раскрыть скобки: $(x + 7)(x + 5) = x^2 + 5x + 7x + 35 = x^2 + 12x + 35$. Результат совпадает с исходным трехчленом.<br>Ответ: $(x + 7)(x + 5)$.</p>"
          ]
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            "text" => "<p>Дан квадратный трехчлен $x^2 + bx + 35$. По условию, один из его корней равен $x_1 = -7$. Корень трехчлена – это такое значение переменной $x$, при котором значение трехчлена обращается в ноль. Следовательно, корни трехчлена являются корнями квадратного уравнения $x^2 + bx + 35 = 0$.</p><p>Для решения задачи удобно использовать теорему Виета. Для приведенного квадратного уравнения вида $x^2 + px + q = 0$ с корнями $x_1$ и $x_2$ выполняются следующие соотношения:<br>$x_1 + x_2 = -p$<br>$x_1 \cdot x_2 = q$</p><p>В нашем случае уравнение имеет вид $x^2 + bx + 35 = 0$, поэтому коэффициенты $p=b$ и $q=35$.</p><p><strong>Найдите другой его корень</strong><br>Воспользуемся формулой для произведения корней: $x_1 \cdot x_2 = q$.<br>Подставим известные значения $x_1 = -7$ и $q = 35$:<br>$(-7) \cdot x_2 = 35$<br>Чтобы найти $x_2$, разделим обе части уравнения на -7:<br>$x_2 = \frac{35}{-7}$<br>$x_2 = -5$<br>Ответ: -5.</p><p><strong>коэффициент b</strong><br>Теперь воспользуемся формулой для суммы корней: $x_1 + x_2 = -p$.<br>Подставим известные корни $x_1 = -7$ и $x_2 = -5$, а также $p = b$:<br>$(-7) + (-5) = -b$<br>$-12 = -b$<br>$b = 12$<br>Ответ: 12.</p><p><strong>разложите трехчлен на множители</strong><br>Общая формула для разложения квадратного трехчлена $ax^2 + Bx + C$ на множители при известных корнях $x_1$ и $x_2$ выглядит так: $a(x - x_1)(x - x_2)$.<br>Наш трехчлен, с учетом найденного $b=12$, имеет вид $x^2 + 12x + 35$. Старший коэффициент $a=1$. Корни $x_1 = -7$ и $x_2 = -5$.<br>Подставим эти значения в формулу разложения:<br>$1 \cdot (x - (-7))(x - (-5))$<br>Это выражение упрощается до:<br>$(x + 7)(x + 5)$<br>Для проверки можно раскрыть скобки: $(x + 7)(x + 5) = x^2 + 5x + 7x + 35 = x^2 + 12x + 35$. Результат совпадает с исходным трехчленом.<br>Ответ: $(x + 7)(x + 5)$.</p>"
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                    "created_at" => "2026-04-10 13:58:26"
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№13 (с. 12)
Условие. №13 (с. 12)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 12, номер 13, Условие

13. Один корень трехчлена $x^2 + bx + 35$ равен $-7$. Найдите другой его корень, коэффициент $b$ и разложите трехчлен на множители.

Решение. №13 (с. 12)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 12, номер 13, Решение
Решение 2 (rus). №13 (с. 12)

Дан квадратный трехчлен $x^2 + bx + 35$. По условию, один из его корней равен $x_1 = -7$. Корень трехчлена – это такое значение переменной $x$, при котором значение трехчлена обращается в ноль. Следовательно, корни трехчлена являются корнями квадратного уравнения $x^2 + bx + 35 = 0$.

Для решения задачи удобно использовать теорему Виета. Для приведенного квадратного уравнения вида $x^2 + px + q = 0$ с корнями $x_1$ и $x_2$ выполняются следующие соотношения:
$x_1 + x_2 = -p$
$x_1 \cdot x_2 = q$

В нашем случае уравнение имеет вид $x^2 + bx + 35 = 0$, поэтому коэффициенты $p=b$ и $q=35$.

Найдите другой его корень
Воспользуемся формулой для произведения корней: $x_1 \cdot x_2 = q$.
Подставим известные значения $x_1 = -7$ и $q = 35$:
$(-7) \cdot x_2 = 35$
Чтобы найти $x_2$, разделим обе части уравнения на -7:
$x_2 = \frac{35}{-7}$
$x_2 = -5$
Ответ: -5.

коэффициент b
Теперь воспользуемся формулой для суммы корней: $x_1 + x_2 = -p$.
Подставим известные корни $x_1 = -7$ и $x_2 = -5$, а также $p = b$:
$(-7) + (-5) = -b$
$-12 = -b$
$b = 12$
Ответ: 12.

разложите трехчлен на множители
Общая формула для разложения квадратного трехчлена $ax^2 + Bx + C$ на множители при известных корнях $x_1$ и $x_2$ выглядит так: $a(x - x_1)(x - x_2)$.
Наш трехчлен, с учетом найденного $b=12$, имеет вид $x^2 + 12x + 35$. Старший коэффициент $a=1$. Корни $x_1 = -7$ и $x_2 = -5$.
Подставим эти значения в формулу разложения:
$1 \cdot (x - (-7))(x - (-5))$
Это выражение упрощается до:
$(x + 7)(x + 5)$
Для проверки можно раскрыть скобки: $(x + 7)(x + 5) = x^2 + 5x + 7x + 35 = x^2 + 12x + 35$. Результат совпадает с исходным трехчленом.
Ответ: $(x + 7)(x + 5)$.

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