If f(x)=x    a    aa    x    aa    a    x=0, then which of the following is correct ?

Applying C1→C1+C2+C3, we getΔ=x+2a    a    ax+2a    x    ax+2a    a    x=(x+2a)1aa1xa1axApplying R1→R1−R2 and R2→R2−R3, we getΔ=(x+2a)0a−x00x−aa−x1ax=(x−a)2(x+2a)    roots are a,a,-2a