(x^(2)-4x-21)=?

(16x^(2)-20x+9)/(8x^(2)+12x+21)=(4x-5)/(2x+3)

If alpha,beta,gamma,delta are the roots of the equation x^(4)+Ax^(3)+Bx^(2)+Cx+D=0 such that alpha beta gamma delta =k and A,B,C,D are the roots of x^(4)-2x^(2)+4x^(2)+6x-21=0 such that A+B=0 then the value of (C)/(A), is

If alpha,beta,gamma,delta are the roots of the equatione roots of the equation x^(4)-2x^(3)+4x^(2)+6x-21=0, then is sum alpha beta

If alpha,beta,gamma,delta are the roots of the equarion x^(4)-2x^(3)+4x^(2)+6x-21=0, then sum alpha beta

In equation x^(4)-2x^(3)+4x^(2)+6x-21=0 if two its roots are equal in magnitude but opposite e in find the roots.

Equation of a circle is 3x^(2) - 4y^(2) - 6x -21=0 then the INCORRECT statement about this conic is

If alpha, beta, gamma are the roots of the equation x^(4)+Ax^(3)+Bx^(2)+Cx+D=0 such that alpha beta= gamma delta=k and A,B,C,D are the roots of x^(4)-2x^(3)+4x^(2)+6x-21=0 such that A+B=0 The correct statement is

If alpha, beta, gamma , delta are the roots of the equation x^(4)+Ax^(3)+Bx^(2)+Cx+D=0 such that alpha beta= gamma delta=k and A,B,C,D are the roots of x^(4)-2x^(3)+4x^(2)+6x-21=0 such that A+B=0 The value of C/A is