Saturday, 29 June 2013

ABSOLUTE VALUE EQUATIONS


If │4x – 7 │= 17; Find  x

Solution

±(4x – 7 )= 17

4x -7= 17    OR   –(4x-7) = 17

4x – 7 = 17    OR   -4x+7=17

4x = 17 + 7    OR   -4x= 17-7

4x = 24     OR   -4x  =  10
4      4                   4        4

x = 6  OR  x = 5/2


Hence x = 6 OR x = 5/2    






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