Question

(2х - 9)^2 = (2х - 3)(2х + 3)

Answer 1

4х^2 - 36х + 81=4х^2 - 9. 36х = 90. х=2,5

Answer 2

(2x - 9)² = (2x - 3)(2x + 3)
4x² - 36x + 81 = 4x² - 6x + 6x - 9
- 36x = - 90
x = 90:36
x = 2,5

Ответ: {2,5}