x2 - 6x - 15 can be factored as (x - 7.899)(x + 1.899)
The number values are actually 3 ± 2√6 so the 'accurate' factors are ( x - [3 + 2√6])(x - [3 - 2√6])
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x2-6x-27 = (x+3)(x-9) when factored
x2 + 6x + 8 =(x + 2)(x +4)
The GCF is x2
x^2+6x-16 (x+2)+(6x-16) x+8+x-16 (x+8)(x-2) here you go :)
If you are looking to factor x^2-6x-40 it'd be (x-10)(x+4). There are two possible solutions. (10,-4)