Monday, 10 July 2017

ABSOLUTE VALUE EQN. 2


If │2x – 123 │= 21; Find  x

Solution

±(2x – 23 )= 21

2x -23= 21    OR   –(2x-23) = 21

2x – 23 = 21    OR   -2x+23= 21

2x = 21 + 23    OR   -2x= 21-23

2x = 44     OR   -2x  =  -2
2      2                2         2

x = 22  OR  x = -1 

Hence x = 22 OR x = -1     


TRY THIS...............................



If │4a – 16 │= 36; Find  a

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