MathDB

5

Part of 1990 Federal Competition For Advanced Students, P2

Problems(1)

determine all rational numbers

Source: Austria 1990

7/10/2009
Determine all rational numbers r r such that all solutions of the equation: rx^2\plus{}(r\plus{}1)x\plus{}(r\minus{}1)\equal{}0 are integers.
number theory unsolvednumber theory