The function f is defined by f x = 4 x - 1 . What is the value of f

Question

The function f is defined by f x = 4 x - 1 . What is the value of f 21 ?

Accepted Answer

Choice C is correct. It&rsquo;s given that function f is defined by the equation f x = 4 x - 1 . The value of f 21 is the value of f x when x = 21 . Substituting 21 for x in the given equation yields f 21 = 4 21 - 1 , which is equivalent to f 21 = 4 1 21 , or f 21 = 4 21 . Choice A is incorrect. This is the value of f 21 when f x = - 4 x , rather than f x = 4 x - 1 . Choice B is incorrect. This is the value of f 21 when f x = 4 x - 1 , rather than f x = 4 x - 1 . Choice D is incorrect. This is the value of f 21 when f x = 4 - 1 x , rather than f x = 4 x - 1 .

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