A
B
C
D
Explanation
Correct answer: B.
Choice B is correct. It's given that for all values of . If , then will equal . Dividing both sides of by gives . Therefore, substituting for in the given equation yields , which can be rewritten as .
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect. This is the value of the constant in the given equation for .
Choice C
Choice C is incorrect and may result from substituting , rather than , into the given equation.
Choice D
Choice D is incorrect. This is the value of that yields for the left-hand side of the given equation; it's not the value of .