A
B
C
D
Explanation
Correct answer: A.
Choice A is correct. Adding to both sides of the given equation yields . Dividing both sides of this equation by yields . Taking the square root of both sides of this equation yields or . Therefore, the positive solution to the given equation is .
Desmos solution:
Note: The equation graphs at x = -3 and x = 3, so the positive solution is 3.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect. This is the solution to the equation , not the given equation.
Choice C
Choice C is incorrect. This is the solution to the equation , not the given equation.
Choice D
Choice D is incorrect. This is the solution to the equation , not the given equation.