Контрольные задания > (2x - 6)(8x + 5) + (3 - 4x)(3 + 4x) = 55

Вопрос:

(2x - 6)(8x + 5) + (3 - 4x)(3 + 4x) = 55

Ответ:

Раскрываем скобки и упрощаем уравнение: 16x^2 + 10x - 48x - 30 + 9 - 16x^2 = 55. Получаем -38x - 21 = 55. Решаем относительно x: -38x = 76. x = -2.

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