1.

Find the smallest number which should be added to the given expression to make it a perfect square?789211 × 7892151. 42. 23. 164. 6

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.



Discussion

No Comment Found

Related InterviewSolutions