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{{ printedBook.courseTrack.name }} {{ printedBook.name }} All parabolas are symmetric – there exists a line that divides the graph into two mirror images. For quadratic functions, that line is called the **axis of symmetry**.

The axis of symmetry is always parallel to the $y-$axis, intersects the vertex of the parabola, and is written as a vertical line, where $h$ can be any real number.

$x=h$