UNLIKE TERMS

Yes, x is different from x2 because x is alone,there's no operation. In x2 there is an operation, (multiplication). We can combine terms with the same exponents. They would be called like terms. You can remember that subtracting a large number from a small number will equal a negative number. Yes, 8m-2m is the same as 8m+ -2m. They are the same because 8m-2m=6m, and 8m+ - 2m=6m. Coefficients are numbers that show how many times a variable will be multiplied. Coefficients are always next to the variables.Coefficients are important because those are the numbers that you are combining.