Question

Уравнение: (х+7)²-(х-2)²=15

Answer 1

(x + 7)² - (x - 2)² = 15

x² + 14x + 49 - (x² - 4x + 4) = 15

x² + 14x + 49 - x² + 4x - 4 = 15

18x + 45 = 15

18x = -30

x = -30/18

x = -5/3

Ответ: -5/3