With great difficulty not knowing if 6x and 27 are plus or minus
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To factorise this completely you need to be aware that 216 = 63. (x3 + 216) = (x + 6)(x2 - 6x + 36)
x(6x - 11)
(x - 6)(x2 + 6x + 36)
-x(x2 - 2)(x2 + 3)
x2+6x-7 = (x+7)(x-1) when factored