Hi

solving Proportions by cross multiplying

         |CROSS MULTIPLYING

      9(a+1) = 2(a-1) 

         7a = -11

          a = -11/7



     

      b^2 = 27

      b = ± sqrt(27)



  

    x(x-1) = 15

   x^2 -x - 15 = 0 

 

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