If $4x^2-12x+9=0$ has equal roots, then the roots are:

If the equation $x^2-ax+1=0$ has two real distinct roots, then:

If the equation $x^2+4x+k=0$ has real and distinct roots, then:

If the equation $9x^2+6kx+4=0$ has equal roots, then $k$ equals

If the equation $4x^2-3kx+1=0$ has equal roots, then $k$ equals:

If the roots of the equation $a{x}^2+bx+c=0$ are equal, then $c$ equals

If the roots of the equation $a{x}^2+bx+c=0$ are reciprocal of each other, then

If $x=1$ is the common root of $a{x}^2+bx+2=0$ and $x^2+x+b=0$, then $ab=$