Номер 10, 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 10, страница 12.

App\Models\Task {#1024 // resources/views/models/task/default.blade.php
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            "text" => "<p>Чтобы проверить, является ли число $2 - 3\sqrt{3}$ корнем уравнения $x^2 - 4x - 23 = 0$, необходимо подставить это число вместо $x$ в уравнение. Если в результате вычислений левая часть уравнения окажется равной нулю, то число является корнем.</p><p>Подставим $x = 2 - 3\sqrt{3}$ в левую часть уравнения:<br>$(2 - 3\sqrt{3})^2 - 4(2 - 3\sqrt{3}) - 23$</p><p>Выполним вычисления по шагам.<br>1. Возведем в квадрат первое слагаемое, используя формулу квадрата разности $(a-b)^2 = a^2 - 2ab + b^2$:<br>$(2 - 3\sqrt{3})^2 = 2^2 - 2 \cdot 2 \cdot 3\sqrt{3} + (3\sqrt{3})^2 = 4 - 12\sqrt{3} + 9 \cdot 3 = 4 - 12\sqrt{3} + 27 = 31 - 12\sqrt{3}$.</p><p><strong>2.</strong> Раскроем скобки во втором слагаемом:<br>$-4(2 - 3\sqrt{3}) = -8 + 12\sqrt{3}$.</p><p><strong>3.</strong> Теперь соберем все полученные значения в исходное выражение и упростим его:<br>$(31 - 12\sqrt{3}) + (-8 + 12\sqrt{3}) - 23$<br>Сгруппируем подобные члены:<br>$(31 - 8 - 23) + (-12\sqrt{3} + 12\sqrt{3})$<br>Вычислим каждую группу:<br>$0 + 0 = 0$.</p><p>Поскольку в результате подстановки мы получили верное равенство $0 = 0$, число $2 - 3\sqrt{3}$ является корнем уравнения $x^2 - 4x - 23 = 0$.</p><p><strong>Ответ:</strong> да, является.</p>"
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            "text" => "<p>Чтобы проверить, является ли число $2 - 3\sqrt{3}$ корнем уравнения $x^2 - 4x - 23 = 0$, необходимо подставить это число вместо $x$ в уравнение. Если в результате вычислений левая часть уравнения окажется равной нулю, то число является корнем.</p><p>Подставим $x = 2 - 3\sqrt{3}$ в левую часть уравнения:<br>$(2 - 3\sqrt{3})^2 - 4(2 - 3\sqrt{3}) - 23$</p><p>Выполним вычисления по шагам.<br>1. Возведем в квадрат первое слагаемое, используя формулу квадрата разности $(a-b)^2 = a^2 - 2ab + b^2$:<br>$(2 - 3\sqrt{3})^2 = 2^2 - 2 \cdot 2 \cdot 3\sqrt{3} + (3\sqrt{3})^2 = 4 - 12\sqrt{3} + 9 \cdot 3 = 4 - 12\sqrt{3} + 27 = 31 - 12\sqrt{3}$.</p><p><strong>2.</strong> Раскроем скобки во втором слагаемом:<br>$-4(2 - 3\sqrt{3}) = -8 + 12\sqrt{3}$.</p><p><strong>3.</strong> Теперь соберем все полученные значения в исходное выражение и упростим его:<br>$(31 - 12\sqrt{3}) + (-8 + 12\sqrt{3}) - 23$<br>Сгруппируем подобные члены:<br>$(31 - 8 - 23) + (-12\sqrt{3} + 12\sqrt{3})$<br>Вычислим каждую группу:<br>$0 + 0 = 0$.</p><p>Поскольку в результате подстановки мы получили верное равенство $0 = 0$, число $2 - 3\sqrt{3}$ является корнем уравнения $x^2 - 4x - 23 = 0$.</p><p><strong>Ответ:</strong> да, является.</p>"
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                0 => App\Models\Term {#1137
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    "page" => Illuminate\Database\Eloquent\Collection {#1504
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                3 => App\Models\Task {#1349
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                4 => App\Models\Task {#1362
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№10 (с. 12)
Условие. №10 (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 10, Условие

10. Проверьте, является ли число $2 - 3\sqrt{3}$ корнем уравнения

$x^2 - 4x - 23 = 0$.

Решение. №10 (с. 12)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 12, номер 10, Решение
Решение 2 (rus). №10 (с. 12)

Чтобы проверить, является ли число $2 - 3\sqrt{3}$ корнем уравнения $x^2 - 4x - 23 = 0$, необходимо подставить это число вместо $x$ в уравнение. Если в результате вычислений левая часть уравнения окажется равной нулю, то число является корнем.

Подставим $x = 2 - 3\sqrt{3}$ в левую часть уравнения:
$(2 - 3\sqrt{3})^2 - 4(2 - 3\sqrt{3}) - 23$

Выполним вычисления по шагам.
1. Возведем в квадрат первое слагаемое, используя формулу квадрата разности $(a-b)^2 = a^2 - 2ab + b^2$:
$(2 - 3\sqrt{3})^2 = 2^2 - 2 \cdot 2 \cdot 3\sqrt{3} + (3\sqrt{3})^2 = 4 - 12\sqrt{3} + 9 \cdot 3 = 4 - 12\sqrt{3} + 27 = 31 - 12\sqrt{3}$.

2. Раскроем скобки во втором слагаемом:
$-4(2 - 3\sqrt{3}) = -8 + 12\sqrt{3}$.

3. Теперь соберем все полученные значения в исходное выражение и упростим его:
$(31 - 12\sqrt{3}) + (-8 + 12\sqrt{3}) - 23$
Сгруппируем подобные члены:
$(31 - 8 - 23) + (-12\sqrt{3} + 12\sqrt{3})$
Вычислим каждую группу:
$0 + 0 = 0$.

Поскольку в результате подстановки мы получили верное равенство $0 = 0$, число $2 - 3\sqrt{3}$ является корнем уравнения $x^2 - 4x - 23 = 0$.

Ответ: да, является.

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