Question

without actually finiding the squares of the numbers find the value of (22)^2-(21)^2

Answer 1

here you may use identity a^2-b^2=(a+b)(a-b)

Answer 2

We know that :

a² - b² = ( a + b )( a - b )

22² - 21² = ( 22 + 21 )( 22 - 21 )

              = 43 × 1

              = 43

The value is 43

Hope it helps ^______^

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