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八年级上学期数学 Unit 1 Review - Coggle Diagram

- - - - If x*2 = a, then x = ±√a (a≥0)
        
        a > 0
        
        √a (principal square root)
        
        Definition
        
        If x*2 = a, then x = √a (x≥0, a≥0, √a≥0)
        
        -√a (negative square root)
        
        a = 0
        
        √0 = 0
        
        a < 0
        
        no square root
  - - - If x*3 = a, then x = ∛a (a is the radicand & can be any number, 3 is called the index)
- - - - Terminating decimal
      - Repeating decimal