factorise121x^2-264x+144
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121x² - 264x + 144 = 0
⇒ (11x)² - 2×11x × 12 + 12² = 0
⇒ ( 11x - 12 )² = 0
⇒ (11x -12)×(11x - 12) = 0
⇒ 11x - 12 = 0
⇒ 11x = 12
⇒ x = 12/11
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