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how to find square root quickly of two or three numbers

how to find square root quickly
of two or three numbers

Grade:11

1 Answers

apurv
49 Points
2 years ago
Though this method will give you approximate value of square root yet this is very helpful most of the times :
Let A be the number whose square root you want to find and let B be a INTEGER nearest to A whose square root we know then
 Sqrt(A) = Sqrt(B) + (A-B)/(2sqrt(B))
This formula is derived with the help derivatives.
Suppose if you need to find the square root of 79 then the nearest integer to 79 whose square root we know is 81 so here A = 79 and B=81 
On substituting A and B in formula you can find square root of 79 very easily.
 

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