Question

How do you factor `3v^6-9v^4+147v^2`?

Answer 1

`3v^2(v^4-3v^2+49)`

Explanation:

That's as far as I was able to get with it. The quadratic formula reveals no real solution for v.
Unless you're looking for imaginary and real solutions, I think that's about all you can do with it.
If it was able to be factored you would end up with something that looks like `3v^2(v^2+?)(v^2-?)`.