We´re going to revise how to find out polynomials´Least Common Factor (or LCD or GCM = Great Common Multiple) in order to add/substract algebraic fractions with unlike denominators:
                                                Great C. Factor o Denominator

                                           


                           

 Adding/substracting fractions

More information:
                          
                                         Adding/substracting Rational Expressions (ppt)