Both are used to make recipecalls.
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Yes, monomials can have negative exponents. When a monomial has a negative exponent, it means that the variable or variables in the monomial are in the denominator of the fraction. For example, x^(-2) is equivalent to 1/x^2. Negative exponents indicate that the variable should be moved to the opposite side of the fraction line and the exponent becomes positive.
The same way you divide positive exponents like ( x^-7 ) / ( x^-12) = x^( -7 - - 12) = x^( -7+12) = x^5
Negative exponents in real life situations are like getting rid of pesky little numbers by sending them to the basement. They basically tell you to take the reciprocal of the number with the positive exponent. So, if you see a negative exponent, just flip the base to get rid of it like a bad habit. It's all about playing mathematical mind games to make the numbers work in your favor.
You can't. You can only subtract like terms. Like terms must have exactly the same variables and exponents on the variables.
You evaluate in exponenets by writting out the exponents like 6*6*6 = you have to find the product of your problem.