Hello.

I can't figure out how to do a nonlinear regression with two variables.

Like this sample:

data={{2,3,4},{3,4,5},{4,5,6}}
I want mathematica to find the best value of a and b:
4 = 3^a + 2^b , 5 = 4^a + 3^b , 6 = 5^a + 4^b

Thanks.