Terms which have the same variables and correspondingpowers and/or
roots. Like terms can be combined using addition an subtraction.
Terms that are not like cannot be combined using addition or subtraction.

Example: 5x^{2}y and
8x^{2}y are
like terms.

5x^{2}y +
8x^{2}y simplifies to
13x^{2}y 5x^{2}y – 8x^{2}y simplifies to –3x^{2}y