The function f is defined by f ( x ) = 3 x - 8 . What is the value

Question

The function f is defined by f ( x ) = 3 x - 8 . What is the value of f 7 ?

Accepted Answer

Choice B is correct. It&rsquo;s given that the function f is defined by f x = 3 x - 8 . The value of f 7 is the value of f x when x = 7 . Substituting 7 for x in the given equation yields f 7 = 3 7 - 8 , which is equivalent to f 7 = 21 - 8 , or f 7 = 13 . Choice A is incorrect. This is the value of f 7 when f x = 3 x + 8 , rather than f x = 3 x - 8 . Choice C is incorrect. This is the value of f 1 , rather than f 7 . Choice D is incorrect. This is the value of f - 7 , rather than f 7 .

Question b5527b