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We say that x = c x = c is a critical point of the function f (x) f ( x) if f (c) f ( c) exists and if either of the following are true. f ′(c) =0 OR f ′(c) doesn't exist f ′ ( c) = 0 OR f ′ ( c) doesn't
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Another set of critical numbers can be found by setting the denominator equal to zero; When you do that, you’ll find out where the derivative is undefined: (x 2 – 9) = 0 (x – 3)(x + 3) = 0; x =
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