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Unlike terms, possibly.

Q: When the letters and exponents in two terms do not match is called what?

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why the exponents can not be negative

Unlike terms.

like terms

They are not. Exponents, powers and indices are terms used for the same thing.

It depends on whether you are working with variables. You cannot add terms with variables that have unlike exponents.

Related questions

identical identities

Sum the exponents.

why the exponents can not be negative

Unlike terms.

like terms

like terms

like terms

They are not. Exponents, powers and indices are terms used for the same thing.

These terms are called like terms.For example: x and 2x are like terms.But: x3 and 4x2 are not like termsbecause although the variables are the same, the exponents are different.

are known as like terms.

You can't. You can only subtract like terms. Like terms must have exactly the same variables and exponents on the variables.

It depends on whether you are working with variables. You cannot add terms with variables that have unlike exponents.