Answer:
(2x - 9)² = x²
4x² - 36x + 81 = x²
3x² - 36x + 81 = 0
x² - 12x + 27 = 0
x = (12 ± √((-12)² - 4(1)(27))/2
= (12 ± √(144 - 108))/2
= (12 ± √36)/2
= (12 ± 6)/2
= 3, 9
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