x2 - 5x + 6 = (x - 2)(x - 3)
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x2 - 5x - 66 is a quadratic expression that factors out to (x - 11)(x + 6)
x - 3
x2 - 5x - 6 = x2 - 6x + x - 6 = x(x - 6) + 1(x - 6) = (x - 6)(x + 1)
(x + 11) and/or (x - 6)
No, as it has two factors, (x - 6)(x + 7)