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For the differentiable function f : R – {0} – R, let 3f (x) + 2f ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ x 1 = x 1 – 10, then ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + 4 1 ' f ) 3 ( f is equal to

1. 5 33
2. 7
3. 5 29
4. 13

Correct answer: 13

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