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avchargrisha
@avchargrisha
July 2022
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(х-11)(х+4)-(х+3(х-3)=21
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xxxeol
Verified answer
Раскрываем скобки и получаем
(х-11)(х+4) - (х+3)(х-3) = 21
Вспоминаем формулу РАЗНОСТИ КВАДРАТОВ.
x² + 4x - 11x - 44
- x² + 9
= 21
Упрощаем
- 7х = 21 -9 + 44 = 56
Находим неизвестное делением
Х = 56 : (-7) = - 8 - ОТВЕТ
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Answers & Comments
Verified answer
Раскрываем скобки и получаем(х-11)(х+4) - (х+3)(х-3) = 21
Вспоминаем формулу РАЗНОСТИ КВАДРАТОВ.
x² + 4x - 11x - 44 - x² + 9 = 21
Упрощаем
- 7х = 21 -9 + 44 = 56
Находим неизвестное делением
Х = 56 : (-7) = - 8 - ОТВЕТ