Question

begin{tabular}{c}
( D=0 )
( (2 a sqrt{a^{2}-5})^{2}-4 cdot 4 cdot 1=0 )
( 6 a^{2}left(a^{2}-3right)=164 )
( a^{4}-3 a^{2}-4=0 )
( a^{4}-4 a^{2}+a^{2}-4=0 )
( a^{2}left(a^{2}-4right)+1left(a^{2}-4right)=0 )
( left.a^{2}-4right)left(a^{2}+1right)=0 )
( a=pm 2 )
hline
end{tabular}

# The values of 'a' for which the equation ? +(2ava-3x+4 -0 possesses equal roots is. (A) + 1 (B) O (C) +4 (D) + 2

Solution