can you factor x2+2?

Use ^ if you mean a power.

x^2+2.

x^{2}+2

Can you factor? No, not nicely. It has complex roots.

(x+\sqrt{2}i)(x-\sqrt{2}i)

can you factor x2+2?

x(2 + 2/x)

but that boils down to the samw thing, so the prev expression is simplified as far as it goes I think