The function f (x) = x-1 changes its value when x changes from xo to xo + dx. Let xo = 0.5 and dx = 0.1. %3D Find a. the change Af = f(xo + dx) – f(xo); b. the value of the estimate df = f'(xo) dx; and %3D c. the approximation error |Af – df|.

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