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Just multiply the coefficients, leave the variable the same, and add the exponents.
Do you mean? 4r2 * 3r2 = 12r4 ====== You multiply the coefficients of the variable terms and add the exponents.
X2 * 2X= 2X3======multiply coefficients and add exponents ( all variables have a 1 as implied exponent )
the answer is simple you can not
When you multiply two variables with different exponents, the exponents are added. For example, if you multiply x^2 by x^3, the result is x^(2+3) = x^5. Similarly, if you multiply x^3 by x^(-2), the result is x^(3+(-2)) = x^1 = x.