3. (10%) Find the constants a and b such that the function $f(x) = \begin{cases} x^2 - 2x, & x \le 1 \\ ax + b, & x > 1 \end{cases} \text{ is differentiable at } x=1.$
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3. (10%) Find the constants a and b such that the function $f(x) = \begin{cases} x^2 - 2x, & x \le 1 \\ ax + b, & x > 1 \end{cases} \text{ is differentiable at } x=1.$