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There is no sign before the 9 at the end of the quadratic and, obviously, the answer will depend on what should have been there.
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(x + 7)(x - 9)
x2-6x+9 = (x-3)(x-3) when factorised.
If there is no common factor then the polynomial cannot be factorised. If there is no common factor then the polynomial cannot be factorised. If there is no common factor then the polynomial cannot be factorised. If there is no common factor then the polynomial cannot be factorised.
36x4 - 81 is a difference of 2 squares and so can be factorised as follows: (6x2 + 9)*(6x2 - 9)
It is simply 2m - 5/9, nothing more, nothing less. It cannot be simplified or factorised. It cannot be evaluated without knowing the value of m.