Answer
$ x^2 + x $
Work Step by Step
$ \frac{ f(x)-f(1) } {x-1} $
$ \frac{ (x^3-x)-(1^3-1) } {x-1} $
$ \frac{ x^3-x } {x-1} $
$ \frac{ x(x^2-1) } {x-1} $
$ \frac{ x(x+1)(x-1) } {x-1} $
$ x(x+1) $
$ x^2 + x $
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