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Given, polynomial is x2 - x - 6
= x2 - 3x + 2x - 6
= x(x - 3) + 2(x - 3)
= (x - 3)*(x + 2)
So, the zeroes of the polynomial are
(x - 3)*(x + 2) = 0
=> x - 3 = 0 and x + 2 = 0
=> x = 3, -2