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What is the absolute value of -a?

1 Answer

May 27, 2015

The absolute value of #(-a)# is
#{ (a " if " a>=0), (-a " if " a<0) :}#

For example

If # a = -7# then #abs(-a) = abs(- (-7)) = abs(7) = 7 (=-a)#

If #a= +4# then #abs(-a) = abs(-4) = 4 (=a)#

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