1. Appendix A.4
Rational Expression

2. Domain of an Algebraic expression
The set of real number for which an algebraic expression is defined is the domain of expression.
Two algebraic expression are equivalent if they have the same domain.

3. The domain of the polynomial.
Set of all real number
The domain of radical expression
Set of all real number for which p(x) greater than
or equal to zero
The domain of fractional expression
Set of all real number which q(x) not equal to zero.

4. Simplifying Rational Expression

6. Operation with Rational Expressions

7. Operation with Rational Expressions

9. Complex Fraction
Fractional expression with separate fractions in the numerator, denominator, or both are called complex fraction.

10. Simplifying a Complex Fraction