MathDB
Uniform number of distinct roots

Source: 2017 Korean Winter Program Practice Test 1 Day 1 #3

January 18, 2017
algebrapolynomial

Problem Statement

Do there exist polynomials f(x)f(x), g(x)g(x) with real coefficients and a positive integer kk satisfying the following condition? (Here, the equation x2=0x^2 = 0 is considered to have 11 distinct real roots. The equation 0=00 = 0 has infinitely many distinct real roots.)
For any real numbers a,ba, b with (a,b)(0,0)(a,b) \neq (0,0), the number of distinct real roots of af(x)+bg(x)=0a f(x) + b g(x) = 0 is kk.