Finding a Line of Symmetry of a Graph

If a graph of a function has a line of symmetry, the function be even about line. This means that if the function is transformed so that the line becomes the y axis, we will be able to writewherefor some number

Supposeshown below.

The graph has a vertical line of symmetry with equation

Suppose we writethenso that the lineis the line

Write thenandis even sooris a line of symmetry.

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