Friday, October 30, 2009

(x-a)(x-b)(x-c)(x-d)

a < b < c < d

x < a - - - - = +
(a,b) + - - - = -
(b,c) + + - - = +
(c,d) + + + - = -
(d,+inf) + + + + = +
Posted by blaoism at 2:22 AM

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