Respuesta :

Given:  f(x) = |x - 1|

A graph of the function is shown below.
The function is either
f(x) = x-1, for x>1
or
f(x) = 1-x, for x<1

Therefore
f'(x) = 1, for x>1
and
f'(x) = -1, for x<1

Answer: -1
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