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p139, #13(a), §2 Graph

(2)

Instead of starting to crunch numbers, look at the pieces first:

Factor x2-9=(x-3)(x+3) is a parabola with zeros at :

Squaring gives a quartic with double zeros at :

Dividing by x will produce a simple pole at x=0 and also a sign change at negative x:

Function y(x):


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