The answer to this depends on what you mean by "x 7"
If you mean:
x2 -7x, then it can be factored out as x(x - 7)
If you mean:
x2 - x7, then you can factor it out as: x2(1 - x5)
If you mean:
x2 - x + 7, then it can not be factored
If you mean:
(x2 - x)7, then the inner term can be factored, giving you (x[x - 1])7
If you mean something else, then you will need to be more clear with your question.
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2(x - 7)(x - 1)
(x + 2)(x - 4)
x(x - 2)
It is impossible but if it were x squared plus 2x minus 15 the equation would be (x+5) (x-3) with x being equal to either -5 or 3. If the original problem was x squared minus 2x minus 15 the equation would be (x-5)(x+3) and x would be equal to either 5 or -3
7