Question

6412 find the least number which must be added ti get a perfect square

Answer 1

Answer:

v64oo=80

square of 81 = 6561

6561-6412 =149

so I 49must be added to 6412t get a perfect square

Answer 2

Answer:

149

Step-by-step explanation:

find the nearest prefect square 6400 ie 80

6412 is graeter than 80^2

so next 81^2 = 6561

so 6561-6412 =149

add 149 to 6412 it becomes prefect square

easy way to find square of two digit number 81^2 =

first unit digit 1^2 = 1

next 8*1=8 again 2*8 =16

next 8^2 = 64

now units place 1 next in16 take 6 and 1 carry

next 64 +1 (carry) so the number is 6561

formula used a^2+2ab+b^2