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Advanced Math / Nonlinear functions Difficulty: Easy

The function f is defined by fx=x3+15. What is the value of f2?

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Explanation

Choice C is correct. The value of f2 is the value of fx when x = 2 . Substituting 2 for x in the given function yields f2=23+15, or f2=8+15, which is equivalent to f2=23. Therefore, the value of f2 is 23 .

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect. This is the value of f2 when fx=x3+15, rather than fx=x3+15.

Choice D is incorrect and may result from conceptual or calculation errors.