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Sticky Note
A2+B2=? ,if A-B=9 AB=3
  1. 87
  2. 81
  3. 85
  4. 27
Explanation

a-b=9 square both sides

(a-b)2=9

(a-b)2=(9)2 

A2-B2-2ab=81

A2-B2-2(3)=81

A2-B2=81+6

A2-B2=87


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