JEE Main 2019 Mathematics question
The number of all possible positive integral values of α for which the roots of the quadratic equation, are rational numbers is:
Answer: (D)
Solution
121 − 24α must be a perfect square: α = 3, 4, 5.
The number of all possible positive integral values of α for which the roots of the quadratic equation, are rational numbers is:
121 − 24α must be a perfect square: α = 3, 4, 5.