If , which of the following is a possible value of x ?
Choice D is correct. If , then taking the square root of each side of the equation gives
or
. Solving these equations for x gives
or
. Of these,
is the only solution given as a choice.
Choice A is incorrect and may result from solving the equation and making a sign error. Choice B is incorrect and may result from solving the equation
. Choice C is incorrect and may result from finding a possible value of
.