Question 202839
f(x) = x^4 +x^3 -2x^2 +x -6
.
f(-x) =  (-x)^4 +(-x)^3 -2(-x)^2 +(-x) -6
.
f(-x) = +x^4 -x^3 -2x^2 -x -6
.
variations  in sign  = 1,,,therefore  1  neg  root 
.
max  of  1  neg  roots