Adding and Subtracting Rational Expressions (Math 3)

Front

Define a rational expression.

Back

A rational expression is a fraction where the numerator and the denominator are both polynomials.

Front

What is the least common denominator (LCD)?

Back

The least common denominator (LCD) is the smallest expression that can be used as a common denominator for two or more fractions.

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Back

Front

What is the first step in adding or subtracting rational expressions?

Back

The first step is to find the least common denominator (LCD) of the fractions.

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Back

Front

Back

First, find the LCD, then rewrite each fraction with the LCD, and finally combine the numerators.

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Back

Front

What is a polynomial?

Back

A polynomial is an expression consisting of variables raised to whole number powers and coefficients.

Front

What is the formula for adding two rational expressions?

Back

To add two rational expressions, find the LCD, rewrite each expression with the LCD, and then add the numerators.

Front

What is the formula for subtracting two rational expressions?

Back

To subtract two rational expressions, find the LCD, rewrite each expression with the LCD, and then subtract the numerators.