The given equation can be thought of as the difference of two squares, where one square isx2 and the other square is (√a)2 . Using the difference of squares formula, the equation can be rewritten as y=(x+√a)(x−√a). Choices A, C, and D are incorrect because they are not equivalent to the given equation. Choice A is incorrect because it is equivalent to y=x2−a2. Choice C is incorrect because it is equivalent to y=x2−
a2
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.Choice D is incorrect because it is equivalent to y=x2+2ax+a2