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Introduction of Algebraic Expressions

A mathematical expression that contains a variable is called an algebraic expression.
Some examples of algebraic expressions are x2, 3x – 2y, . Two algebraic expressions are called like terms if both the variable parts and the exponents are identical. That is, the only parts of the expressions that can differ are the coefficients.
For example, 5y3 and  are like terms, as are x + y2 and –7(x + y2). However, x3 and y3 are not like terms, nor are xy and 2 – y.

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