10-5Addition and Subtraction:Unlike Denominators Standard 13.0: Add and subtract rational expressions.
Factor each expression. Form the product using each factor the greatest number of times it occurs. Least Common Multiple Rule
Adding and Subtracting Rules: Unlike Denominators • Change Subtraction to Add the Opposite • Factor the Denominator, if possible • Find a Common Denominator (LCD) • Multiply the Numerator and Denominator by the missing factor • Add the Numerator • Factor the Numerator if possible • Simplify if possible