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To understand y = f(-x - 2) from y = f(x), how can the inside expression be written?

Answer and explanation

Correct answer: f(-(x + 2))

Factor the negative sign from the inside expression: -x-2 = -(x+2). Hence f(-x-2) can be written as f(-(x+2)), which is option A. This form makes the transformation structure visible: the negative applied to the input indicates reflection in the y-axis, while the addition of 2 inside the brackets corresponds to a horizontal shift when the transformation is interpreted carefully. Option B changes the sign of the shift and omits the reflection, option C omits the reflection entirely, and option D represents -(x-2)=-x+2, which is a different expression. Algebraic factoring must therefore be done before interpreting the graph.

Related tags

Graph-TransformationsFunction-NotationReflectionGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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