x²-18x+81 factorize it
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Answer:
(x - 9)²
Step-by-step explanation:
==: x² - 18x + 81 = 0
==: x² - 9x - 9x + 81 = 0
==: x (x - 9) - 9 (x - 9) = 0
==: (x - 9) (x - 9) = 0
==: (x - 9)² = 0
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