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2010 Algebra #6: Fill in the Signs

Source:

July 15, 2012
algebrapolynomial

Problem Statement

Suppose that a polynomial of the form p(x)=x2010±x2009±±x±1p(x)=x^{2010}\pm x^{2009}\pm \cdots \pm x \pm 1 has no real roots. What is the maximum possible number of coefficients of 1-1 in pp?