i don't see your hang up, Dan.

you have there are not many choices of where to put anything. you know that , so just replace with that wherever you see it, so you get

so you get

so here your a = 1, your b = 0.033 and your c = -0.0033

so,

and just plug that in your calculator

when you get the answer, take the logarithm of it and then take it's negative and you have the pH