unlike terms

X is different than X^2 because X^2 is being times by it's self. We could combine terms that have the same exponent because it has to have the same terms and variable, so no you can combine like exponents. They could be called same variables. I learned how to do K.F.C. Yes 8m - 2m is the same 8m+-2m you could use K.F.C for the equation. Coefficients are problems to the power for EX 4x^2+ 2x the coefficients of x^2 and 2 it is important because the coefficients of x is being times by it self.