Consider the equation , where is a natural number. Then the number of all distinct values of n , for which the given equation has integral roots, is equal to
- (A)7
- (B)8
- (C)6✓ Correct
- (D)5
Answer: (C)
Solution
Completing the square, becomes , so the roots are integers exactly when is a perfect square. For the value ranges over to , and the perfect squares there are . These correspond to , so there are distinct values of .
JEE Main · 2025 · 04 Apr 2025 · Shift 1 · Single correct option