What is #abs(-9)#?

1 Answer
George C.
Jun 20, 2015

#abs(-9) = 9#

Explanation:

If #x > 0# then #abs(x) = x > 0#

If #x = 0# then #abs(x) = 0#

If #x < 0# then #abs(x) = -x > 0#

For all #x# we have #abs(x) >= 0#

#abs(x)# is the 'size' of #x#, regardless of its sign.

Equivalently, it is the distance of #x# from #0#

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