Question 1068311
root of 0 is factor x.
When there are two roots of 0, the factor is x^2
root of 3 means factor (x-3), because x-3=0 gives root 3
root of -3 means factor (x+3)
(x+3)(x-3)x^2 are the factors
x^2(x^2-9)=0;
x^4-9x^2=0
Note, a repeated root "bounces" off the x-axis.
{{{graph(300,300,-10,10,-10,10,x^4-9x^2)}}}