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Консультация № 190633
04.03.2017, 00:09
0.00 руб.
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Здравствуйте! Прошу помощи в следующем вопросе:
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Обсуждение
04.03.2017, 04:19
общий
это ответ
Здравствуйте, svrvsvrv!
Сделаем замену y = x[sup]2[/sup] + 3, тогда уравнение примет вид y[sup]2[/sup] - 11y + 28 = 0. Корни квадратного уравнения ay[sup]2[/sup] + by + c = 0 определяются по формуле
В данном случае a = 1, b = -11, c = 28 и
откуда y[sub]1[/sub] = 7, y[sub]2[/sub] = 4. Возвращаясь к x, получаем x[sup]2[/sup] + 3 = 7 и x[sup]2[/sup] + 3 = 4, откуда x[sub]1,2[/sub] = [$8730$]4 = [$177$]2, x[sub]3,4[/sub] = [$8730$]1 = [$177$]1.
Сделаем замену y = x[sup]2[/sup] + 3, тогда уравнение примет вид y[sup]2[/sup] - 11y + 28 = 0. Корни квадратного уравнения ay[sup]2[/sup] + by + c = 0 определяются по формуле
В данном случае a = 1, b = -11, c = 28 и
откуда y[sub]1[/sub] = 7, y[sub]2[/sub] = 4. Возвращаясь к x, получаем x[sup]2[/sup] + 3 = 7 и x[sup]2[/sup] + 3 = 4, откуда x[sub]1,2[/sub] = [$8730$]4 = [$177$]2, x[sub]3,4[/sub] = [$8730$]1 = [$177$]1.
5
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