Tuesday, June 28, 2005

 

Problem# 9

OK! Now some algebra.

The real set {a, b, c} is such that the equation
x3 + ax2 + bx + c = 0

has three distinct real roots and
(x2 + x + 2005)3 + a(x2 + x + 2005)2 + b(x2 + x + 2005) + c > 0
for all real values of x. Show that, for the same set {a, b, c},
(2005)3 + a(2005)2 + b(2005) + c > 1/64

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