The roots of the equation `x^2+4=0` are

For what values of k ,the roots of the equation x^(2)+4x+k=0 are real?

If alpha, beta are the roots of the equation x^(2)-2x+4=0 then (alpha^(10)+beta^(10))/(4) =

If -4 is the root of the equation x^(2)+kx-4=0 and the quadratic equation x^(2)+px+k=0 has equal roots then find values of k and p

If alpha and beta are the roots of the equation x^(2)-x-4=0 , find the value of (1)/(alpha)+(1)/(beta)-alpha beta :

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

If cos^(4)theta+p, sin^(4)theta+p are the roots of the equation x^(2)+a(2x+1)=0 and cos^(2)theta+q,sin^(2)theta+q are the roots of the equation x^(2)+4x+2=0 then a is equal to