Question 1175933
this is f(x)=2x^7-11x^2+9x. 
f(x)=x(2x^6-11x+9) 2 sign changes so 2 or 0 positive roots
x=0, 1 root, x=1, 2 roots (positive)
4 roots are complex

f(-x)=-2x^7-11x^2-9x no sign changes, no negative roots.


{{{graph(300,300,-5,5,-10,10,-11x^2+9x+2x^7)}}}