Definitions:A term in an algebraic expression can be a constant, a variable or a product of constants and variables separated by the signs of addition (+) or subtraction (− ) . Examples: 27, x, xyz, 21​ x2 yz etc.The number factor of the term is called its coefficient.
The expression
3 x2 y2 − 5 x2 y2 z2 + z2 consists of three terms , i.e.,​
3 x2 y2, − 5 x2 y2 z2 and z2.
The coefficient of
3 x2 y2 is 3. The coefficient of − 5 x2 y2 z2 is − 5 and the coefficient of z2 is 1.