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Algebraic Identity (a - b)²
1)If a=0 cm and b=7 cm then (a-b)² = ?
  
2)If a=10 cm and b=4 cm then (a-b)² = ?
  
3)If a=5 cm and b=0 cm then (a-b)² = ?
  
4)Find the value of 99² by using identity (a-b)².
  
5)If (a-b)²= 4 and a= 8 then what is the value of b?