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x^2 - y^2 - 4 is in its simplest form.
The expression cannot be factorised.
(x + 2)(x - 2)
There are no rational factors.
-22 - -22
(2x - 1)(2x + 3)
(x-3)(x+2)
x(x-1)
(x + 2)(x - 4)
(x + 2)(x - 9)
(x - 5)(x + 3)
(x + 1)(x - 8)
x(x - 7)
x(x - 2)