Ответ:
x = 20
Объяснение:
(4-x)(x+5)+x²=0
4x + 20 - x² - 5x + x² = 0
20 - x = 0
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Ответ:
x = 20
Объяснение:
(4-x)(x+5)+x²=0
4x + 20 - x² - 5x + x² = 0
20 - x = 0
x = 20