greatest common factor 10b^2 and 4a^3
the answer will be 2. the gcf of the equation is 2 because 2 goes into 10 by 5 and into 4 by 2 leaving you with 2(5b^2+2a^3).
The answer is 2.(This is the same as the GCF of 10 and 4. The variable portions of the expressions have no common factors.)