Been trying to balance this equation for a while, but can't get the right answer. any help would be apperciated!

CH2O (aq) + NO3 - ---> N2 + HCO3 - + CO2(g)

3 answers

You need to learn to do these. Here is a link that will get you started.
It won't balance without a little nudge here and there.

20CH2O (aq) + 16NO3^- + 6H^+ ---> 8N2 + 10HCO3^- + 10CO2(g) + 18H2O
http://www.chemteam.info/Redox/Redox.html
@DrBob222:

I know how to do redox problems. It's just that this problem has a specific answer with the coefficients being 5,4=>2,4,1,3.

Where no protons remain in the final answer
OK but you have six coefficients in 5,4 ==> 2,4,1,3 and you don't have but five substances. And the equation doesn't balance although you may not need it to balance. I think redox part is balanced and that may be all you need.