Question

Numbers of integral values of ‘a’ for which the quadratic equation x2 -(a+1)x + (a- 3) =0 has both integral roots are

(1)2

(2)3

(3)4

(4)5

Answer 1

Correct option (1)2

Explanation:

(x -a) (x -1) = 3

x-1=1 or -1 or 3 or -3 simultaneously solve for x -a = 3- 3,1,-1 respectively