SAT Math · Nonlinear functions · hard
For the function f(x) = ((x-2)(x+3))/((x-2)(x-5)), which statement correctly describes its behavior at x=2 and x=5?
For the function , which statement correctly describes its behavior at and ?
Answer and explanation
Answer: C: There is a removable discontinuity (a hole) at x=2 and a vertical asymptote at x=5.
The factor appears in both the numerator and the denominator, so it cancels, leaving for . At , the original function is undefined, but the simplified form gives a finite value of , so there is a removable discontinuity (a hole). At , the factor remains in the denominator, so the function blows up and there is a vertical asymptote. That is choice C. Choice A treats both as asymptotes. Choice B swaps the roles. Choice D ignores that both and make the original denominator zero.
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