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Precalc0108to0109-page3

Precalc0108to0109-page3 - (Section 1.8 x = f y 1.8.3 The...

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(Section 1.8: x = fy () ) 1.8.3 • The graph of x = y 2 below is a parabola opening to the right . WARNING 2 : The graph never goes to the left of the y -axis, because squares of real numbers are never negative . • Look at the table. f is even, so each pair of opposite y values yields a common function value , or x . Graphically , this means that every point x , y on the graph has a “mirror image partner” x , ± y that is also on the graph, and the graph is symmetric about the x -axis ( WARNING 3 ) . A function f is even ± f ² y = , ³ y ´ Dom f ± The graph of x = is symmetric about the x- axis . f is decreasing on the
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