ADDITION AND SUBTRACTION OF ALGEBRAIC EXPRESSIONS EXAMPLES

FOR EXAMPLE 
  

             TO subtract 6y from 12.
  
             We can add 12 y and (-6y)
   
             Thus we have. 12y+ (-6y)= 12y-6y
   
                                                        =y(12-6)

                                                        =6y

    Now, let us subtract  -mn from 3mn.  Additive  inverse of -mn  is mn . Hence  , we have to add mn with 3mn . Thus, 


                     3mn+mn=mn(3+1)

                   3mn+mn    =4mn



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