Question

Find the least no. Which must be added to 8400 to obtain a perfect square. Find the square root of this perfect square

Answer 1

first find the square root of 7900.
by prime factorisation method
quotient+i 2=88+1=89
89x89=7921
there for 7921-7900=21
there for root of 7921=89

Answer 2

64 should be added to 8400 to make it a perfect square of 92