Number of integral values of a for which the equation `x^2-(a+1)x+a-1=0` , has integral roots, is equal to -

The number of integral values of b, for which the equation x^(2)+bx-16=0 has integral roots, is

The number of integral values of b, for which the equation x^(2) + bx - 16 = 0 has integral roots is

The number of integral values of 'a' for which the quadratic equation x^(2)+(a+19)x+19a+1=0 has integral roots,are

Number of integral values of a such that the quadratic equation x^(2)+a x+a+1=0 has integral roots is

The total number of integral values of a so that x^2-(a+1)x+a-1=0 has integral roots is equal to a. 1 b. 2 c. 4 d. none of these

The number of integral values of a for which the quadratic equation (x+a)(x+1991)+1=0 has integral roots are a. 3 b. 0 c. 1 d. 2

The number of integral values of a for which the quadratic equation (x+a)(x+1991)+1=0 has integral roots are a. 3 b. 0 c. 1 d. 2

The number of integral values of a for which the quadratic equation (x+a)(x+1991)+1=0 has integral roots are a. 3 b. 0 c. 1 d. 2

The number of integral values of a for which the quadratic equation (x+a)(x+1991)+1=0 has integral roots are a.3 b.0 c.1 d.2