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The graph of y = 1/(x + 1)^2 is symmetric about which line?

Answer and explanation

Correct answer: x = −1

The parent graph y = 1/x^2 is symmetric about the y-axis, whose equation is x = 0. Replacing x by x + 1 shifts the graph one unit to the left, so its vertical symmetry axis shifts from x = 0 to x = −1. This can also be checked algebraically: for any non-zero t, f(−1 + t) = 1/t^2 and f(−1 − t) = 1/(−t)^2 = 1/t^2. Thus points equally distant from x = −1 have equal function values, proving reflectional symmetry about that line. The line y = 0 is only a horizontal asymptote, while x = 1 and y = −1 do not preserve the graph. Hence option A is correct.

Related tags

GraphsRational-FunctionsSymmetryTransformationsStandard-FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematics

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