ответ: - 2
Объяснение:
(2x + 5)(x - 6) + 2(3x + 2)(3x - 2) = 5(2x + 1)² + 11
2x² - 12x + 5x - 30 + 2(9x² - 4) = 5(4x² + 4x + 1) + 11
2x² - 7x - 30 + 18x² - 8 = 20x² + 20x + 5 + 11
20x² - 7x - 38 = 20x² + 20x + 16
20x² - 7x - 38 - 20x² - 20x - 16 = 0
-27x - 54 = 0
27x = - 54
x = - 2
ответ: - 2
Объяснение:
(2x + 5)(x - 6) + 2(3x + 2)(3x - 2) = 5(2x + 1)² + 11
2x² - 12x + 5x - 30 + 2(9x² - 4) = 5(4x² + 4x + 1) + 11
2x² - 7x - 30 + 18x² - 8 = 20x² + 20x + 5 + 11
20x² - 7x - 38 = 20x² + 20x + 16
20x² - 7x - 38 - 20x² - 20x - 16 = 0
-27x - 54 = 0
27x = - 54
x = - 2