Turkish NMO First Round - 2012 Problem - 15 {Algebra}
Source:
July 1, 2012
Problem Statement
If x4+8x3+18x2+8x+a=0 has four distinct real roots, then the real set of a is<spanclass=′latex−bold′>(A)</span>(−9,2)<spanclass=′latex−bold′>(B)</span>(−9,0)<spanclass=′latex−bold′>(C)</span>[−9,0)<spanclass=′latex−bold′>(D)</span>[−8,1)<spanclass=′latex−bold′>(E)</span>(−8,1)