If roots of quadratic equation `x ^2 −kx+4=0` then k will be a. 2 b 1 c. 3 d. 4

If 2 is a root of the equation x^4+2x^3-3x^2+kx-4=0 , then k=

If alpha and beta are roots of the quadratic equation x ^(2) + 4x +3=0, then the equation whose roots are 2 alpha + beta and alpha + 2 beta is :

If x=3 is one root of the quadratic equation x^2-2kx-6=0 , then find the value of k

IF both the roots of the quadratic equation x^2-2kx+k^2 +k -5=0 are less than 5, then k lies in the interval

Let a,b,c,d be distinct real numbers and a and b are the roots of the quadratic equation x^2-2cx-5d=0 . If c and d are the roots of the quadratic equation x^2-2ax-5b=0 then find the numerical value of a+b+c+d .

If one real root of the quadratic equation 81x^2 + kx + 256=0 is cube of the other root, then a value of k is