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Find the smallest number which should be added to the given expression to make it a perfect square?789211 × 7892151. 42. 23. 164. 6 |
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Answer» Correct Answer - Option 1 : 4 Given: 789211 × 789215 Concept: a2 - b2 = (a - b)(a + b) Calculation: Let 789213 be x, then 789211 = (a - 2) and 789215 = (a + 2) now, 789211 × 789215 = (a - 2)(a + 2) ⇒ a2 - 4 ∴ To make a perfect square we added 4 in this expression. |
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