If the equation `x^2+kx+k =0` has only one solufion, find the possible values of k.

If the equation 4x^2- 5x + k = 0 has two equal solutions. Find the value of k.

If the equation 2x^(2) + (a+3)x + 8 = 0 has equal roots, then one of the values of a is

If the lines 2 x+y-3=0,5 x+k y-3=0 and 3 x-y-2=0 are concurrent, find the value of k .

Find the least value of k for which the function x^(2) + kx + 1 is an increasing function in the interval 1 lt x lt 2 .