Question 275468
X^4-12x^2+11=0
(X^2-11)(X^2-1)=0
(X^2-11)(X+1)(X-1)=0
X^2-11=0
X^2=11
X=SQRT11 ANS.
X+1-0
X=-1 ANS.
X-1=0
X=1 ANS.