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Sticky Note
(7 - 2 )( 7+ 2) = ?
  1. 47
  2. 49
  3. 14
  4. 45
Explanation

(7 - 2)(7 + 2) = ?


This is a standard identity:  

(a - b)(a + b) = a² - b²


Here,  

a = 7, b = 2  

So,  

(7 - 2)(7 + 2) = 7² - 2² = 49 - 4 = 45


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