The function f is defined by f x = 5 x + 8 . For what value of x does

Question

The function f is defined by f x = 5 x + 8 . For what value of x does f x = 58 ?

Accepted Answer

Choice A is correct. It's given that the function f is defined by f x = 5 x + 8 . Substituting 58 for f x in this equation yields 58 = 5 x + 8 . Subtracting 8 from both sides of this equation yields 50 = 5 x . Dividing both sides of this equation by 5 yields 10 = x . Therefore, the value of x when f x = 58 is 10 . Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect. This is the value of f 58 , not the value of x when f x = 58 .

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