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The graph of f(x) = −x³ is the reflection of y = x³ in which axis?

Answer and explanation

Correct answer: x-axis

The governing transformation rule is that replacing y=f(x) by y=−f(x) changes every output to its opposite while leaving the input coordinate unchanged. A point (a,a³) on y=x³ therefore becomes (a,−a³) on y=−x³. This is exactly reflection across the x-axis, because reflection in that axis preserves the x-coordinate and reverses the sign of the y-coordinate. For example, the point (2,8) changes to (2,−8), and the point (−1,−1) changes to (−1,1). Reflection in the y-axis would change (a,a³) to (−a,a³), which corresponds to replacing x by −x rather than placing a negative sign outside the function. Hence option A is correct; the two lines listed in options C and D are not the relevant axes of reflection.

Related tags

Graphs Of Standard FunctionsCubic FunctionReflectionGraph TransformationRelations And FunctionsMathematicsClass 11 Mcq

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