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X to the 7th power. X^m*X^n=X^m+n That means when you multiply variables with the same base, you add the exponents.
m^4 n^5 - m^20 n^21
The number that is multiplied by itself 4 times is called the fourth power of that number. In mathematical terms, this is denoted as "n^4" where "n" is the base number. When a number is raised to the fourth power, it is multiplied by itself four times, resulting in the number multiplied by itself four times.
the sum of 3 times m and n
any negative number -n can be written as -1*n (minus 1 times that number). so, multiplying two negative numbers together:-n * -m = -1*n * -1*m = -1*-1*n*m = n*m (which is always positive)-6*-9 = -1*-1*6*9 = 6*9 = 54