EX: -2 - 5= -7 cause you change the subtraction to addition and change the 2nd number to the opposite number (ex: 5, -5)
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you do not do anything when you add numbers with exponents. you just figure out the answer. it is only if you multiply numbers with exponents, where you add the exponents..
When multiplying numbers with exponents, you add the exponents.
When dividing numbers (or variables) subtract the exponents. Remember, an exponent indicates a kind of multiplication, it is the number of times that a number is multiplied by itself. If you are dividing by that same number, then clearly you are multiplying it by itself a fewer number of times. Division is the inverse function of multiplication.
When dividing numbers with exponents, subtract the bottom exponent from the top exponent.
It means that it has constants and variables that has a form of something like 7x2+2x+5 or something like that. Variables can not be used as exponents though, and exponents have to be whole numbers. Also, variables can not be a denominator.