The range of k for which both the roots of the quadratic equation (k+1)x2−3kx+4k=0 are greater than 1, is
The smallest value of k, for which both the roots of the equation x2−8kx+16(k2−k+1) = 0 are real, distinct and have values at least 4,is
The positive value of k, for which both equations: x2 + kx + 64 =0 and x2 - 8x + k =0 have real roots is___________
(ii) Write all the values of k for which the quadratic equation x2 + kx + 16 = 0 has equal roots. Find the roots of the equation so obtained.