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What appears in the graph of (y=\frac{x^2-9}{x-3}) at (x=3)?

Answer and explanation

Correct answer: A hole

The direct answer is option A: a hole. Factor the numerator: \(x^2-9=(x-3)(x+3)\). For \(x\ne3\), the expression simplifies to \(\frac{(x-3)(x+3)}{x-3}=x+3\). However, the original denominator is zero at \(x=3\), so that input is excluded even after cancellation. The simplified line would approach the missing point \((3,6)\), producing a removable discontinuity, or hole. Option A is correct. Option B, a vertical asymptote, would occur when the denominator’s zero factor remains uncancelled, as in \(1/(x-3)\). Option C, a vertex, belongs to a parabola or similar turning graph, not this cancelled line. Option D, a maximum point, is not present because the line has no maximum. Always check the original domain after cancelling factors; cancellation does not restore a forbidden input.

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GraphsRationalHole

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