<PRE><B>Question 69041</B>
Problem# 54 
(2)/(5w+10) - (3)/(2w-4) 
    
   2/(5w + 10) -  3 / (2w-4)
 now the LCM of the denominator will be:  (5w+ 10) x (2w - 4)
                                        = 5w x 2w + 5w x (-4) + 10w -40
                                        = 10w^2 + 20w -10w-40
get similar terms together               = 10 w^2 +10w - 40

The expression will be [ 2 x (2w-4) - 3 x (5w+10) ]/(10w^2 +10 w - 40)
                      =( 4w- 8 -15w -30)/10(w^2 +w - 4)

                       =(-11w -38)/10(w^2+w-4)
                       = (11w+38) /10(4-w-w^2)

</PRE>