JEE Main · 2025 · 04 Apr 2025 · Shift 1 · Quadratic Equations and Inequalities

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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
  1. (A)7
  2. (B)8
  3. (C)6✓ Correct
  4. (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

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