p(x) = (x - 1)(x - 2(x - 3)
note that p(1) = 1 - 6 + 11 - 6 = 0
x = 1 is a root ⇒ (x - 1 ) is a factor
1 | 1 - 6 + 11 - 6
↓ 1 - 5 +6
1 - 5 6 0
p(x) = (x - 1)(x² - 5x + 6 ) = (x - 1)(x - 2)(x - 3)
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