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Mathematics 23 Online
OpenStudy (aonz):

Im just making up a question so i can understand absolute values better. Can some1 explain pls? what is the answer for |x|=5? Would it be positive and negative 5? OR x=5 if x>0, x=-5 if x<0

jimthompson5910 (jim_thompson5910):

x = 5 if x > 0 is a bit silly to say because 5 is clearly greater than 0 so "x = 5 if x > 0" is always true

jimthompson5910 (jim_thompson5910):

you could say |x| = 5 x = 5 or x = -5

jimthompson5910 (jim_thompson5910):

or you could say |x| = 5 x = +-5 to shorten things up

OpenStudy (aonz):

Because there was a question that says use the definition of absolute value to write the expression without absolute value signs

jimthompson5910 (jim_thompson5910):

well the definition is if |x| = k where k is some positive number, then x = k or x = -k

OpenStudy (aonz):

|x+5| and that would be x+5 if x>0 -x - 5 if x<0

jimthompson5910 (jim_thompson5910):

you could go that route if you wanted

OpenStudy (aonz):

ok thanks i understand absolute value better now :)

jimthompson5910 (jim_thompson5910):

ok that's great

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