Hey everyone! I'm new here and I'd be grateful of your help.

I would like to know how to factor and find the roots/zeroes of:

$\displaystyle 14x^6-9x^2+2$

I heard of a method where you can just substitute $\displaystyle a=x^2$ but I couldn't get any steps past it: $\displaystyle 14x^3-9x+2$

Thanks for your time!

--essaymasters