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 $ab=$

If the sum and product of the roots of the equation $k{x}^2+6x+4k=0$ are equal, then $k$ equals

Value of $k$ for which the equation $2x^2-kx+k=0$ has equal roots is:

If the equation $x^2-bx+1=0$ does not posses real roots, then:

If $a$ and $b$ are the roots of the equation $x^2+ax+b=0$, then $a+b=$

If $2$ is one of the roots of the equation $2x^2+kx+4=0$, then the other root is:

If $\sin \alpha$ and $\cos \alpha$ are the roots of $a{x}^2+bx+c=0$, then $b^2$ equals: