Question which-
Which of the following is a solution to the equation above?
2
Which of the following is a solution to the equation above?
Hard-difficulty · SAT Math · Nonlinear Equations in One Variable — Quadratic solving (factoring, quadratic formula, completing square). Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. A quadratic equation in the form , where a, b, and c are constants, can be solved using the quadratic formula:
. Subtracting
from both sides of the given equation yields
. Applying the quadratic formula, where
,
, and
, yields
. This can be rewritten as
. Since
, or
, the equation can be rewritten as
. Dividing 2 from both the numerator and denominator yields
or
. Of these two solutions, only
is present among the choices. Thus, the correct choice is D.
Choice A is incorrect and may result from a computational or conceptual error. Choice B is incorrect and may result from using instead of
as the quadratic formula. Choice C is incorrect and may result from rewriting
as
instead of
.
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