(x - y - z)(x - y + z)
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x2 - 4
Answer: x (x2-x)
x2 + 10y + 25 doesn't factor neatly. If that was x2 + 10x + 25, it would factor to (x + 5)(x + 5) or (X + 5)2
x2-3x-28
This is not factorable. You would have to do the quadratic formula for this problem.