Hi,

    Let X = x^2

     X^2 + 3X = 10

     X^2 + 3X-10 = 0

  (X+5)(X-2) = 0

  (X+5)= 0 ,  X = -5   | X = x^2 0r  x =  ,  x = 

  (X-2)= 0 ,  X = 2   ,  x =  

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