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ax^2 +bx+c=0 (Δ = b^2 -4ac (Δ>0 (due soluzioni reali e distinte), Δ<…

- - - - 4x^2 -9=0
        
        4x^2 =9
        
        x= 9/4
        
        x = 3/2
        
        x = - 9/4
        
        x= -3/2
        
        Δ= -4ac
        
        Δ = 144
        
        x1,2= +- 12/8
        
        x1= 12/8
        
        1 more item...
        
        x2= -12/8
        
        1 more item...
  - - - 5x^2 +2x=0
        
        x(5x+2)=0
        
        x=0
        
        5x+2=0
        
        x=-2/5
        
        Δ= b^2= 4
        
        x1,2 = (-2 +- 2)/10
        
        0
        
        -4/10