Square Calculation in tricks

by Ranganathan[ Edit ] 2012-10-06 10:14:32

Square Calculation Formulla:

(a)² = (a + b)² + (a - b)² / 2 - b²

Example:

11² = (11 + 9)² + (11 - 9)² / 2 - 9²

11² = 121

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