Ответ:
(2x + 5)(x - 6) + 2(3x + 2)(3x - 2) = 5(2x + 1)² + 11
2х² - 12х + 5х - 30 + 2(9х² - 4) = 5(4х² + 4х + 1) + 11
2х² - 7х - 30 + 18х² - 8 = 20х² + 20х + 5 + 11
20х² - 7х - 38 = 20х² + 20х + 16
20х² - 7х - 20х² - 20х = 16 + 38
-27х = 54
х = -54 : 27
х = -2
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Ответ:
(2x + 5)(x - 6) + 2(3x + 2)(3x - 2) = 5(2x + 1)² + 11
2х² - 12х + 5х - 30 + 2(9х² - 4) = 5(4х² + 4х + 1) + 11
2х² - 7х - 30 + 18х² - 8 = 20х² + 20х + 5 + 11
20х² - 7х - 38 = 20х² + 20х + 16
20х² - 7х - 20х² - 20х = 16 + 38
-27х = 54
х = -54 : 27
х = -2