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If the graph (y=f(x)) is changed to (y=|f(x)|), what happens to the part below the (x)-axis?

Answer and explanation

Correct answer: It is reflected above the (x)-axis

The direct answer is option A: the part below the x-axis is reflected above it. The expression \(|f(x)|\) changes every negative output into its positive opposite, while positive outputs remain unchanged. For example, if a point on \(y=f(x)\) is \((a,-3)\), then the new graph has \((a,3)\). A point with height 0 stays on the x-axis. Thus the x-coordinates do not change; only negative y-values turn upward. Option A is correct. Option B is wrong because the lower part does not disappear; it supplies the reflected upper part. Option C is wrong because reflection is vertical, not movement toward the y-axis. Option D is wrong because a negative value changes sign, so the graph does not remain unchanged wherever \(f(x)<0\). A useful rule is: \(y=|f(x)|\) folds everything below the x-axis upward. Memory cue: outside absolute value affects heights, not x-positions.

Related tags

GraphsTransformationModulus

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