Question 141197
Q(y)=y^4-10y^2+9
Q(Y)=(Y^2-9)(Y^2-1)
Q(Y)=(Y+3)(Y-3)(Y+1)(Y-1)
Y+3=0 OR Y=-3
Y-3=0 OR Y=3
Y+1=0 OR Y=-1
Y-0=0 OR Y=1 
Answer b) is the correct answer.