The contentment obtained after eating X-...

The contentment obtained after eating X-units of a new dish at a trial function is given by the function f(x) `= x^(3) + 6x^(2) + 5x +3`. If the marginal contentment is defined as the rate of change f(X) with respect to the number of units consumed at an instant, then find the marginal contentment when three units of dish are consumed.

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The correct Answer is:

68 units.

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