greatest common factor of - 27x2yz5 + 15x3z3

The GCF will be found as follows:

-27x^2yz^5+15x^3z^3

-27x^2yz^5=-3*3*3*x*x*y*z*z*z*z*z

15x^3z^3=3*5*x*x*x*z*z*z

the GCF is the product of the lowest power of each factor that appears in each term

thus we shall have:

3*z*z*z*x*x

=3z^3x^2