The function f is defined by f x = 5 x 2 . What is the value of f 8

Question

The function f is defined by f x = 5 x 2 . What is the value of f 8 ?

Accepted Answer

Choice D is correct. It's given that the function f is defined by f x = 5 x 2 . Substituting 8 for x in f x = 5 x 2 yields f 8 = 5 8 2 , which is equivalent to f 8 = 5 64 , or f 8 = 320 . Therefore, the value of f 8 is 320 . Choice A is incorrect. This is the value of f 8 if f x = 5 x . Choice B is incorrect. This is the value of f 8 if f x = 5 x + 2 . Choice C is incorrect. This is the value of f 8 if f x = 5 x 2 .

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