x2-6x can be factored into x(x-6). Simply factor out the "x" from both factors.
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x2-6x+9 = (x-3)(x-3) when factorised.
x2 - 6x - 16 = (x + 2)(x - 8)
(x + 4)(x + 2)
X2 - 6X + 27 = 0 what are the factors of 27 that add to - 6? None! This polynomial is unreal and does not intersect the X axis.