Hi



    y + 10 = y^2-4y+4

    y^2 -5y -6 = 0

factoring

   (y-6)(y+1) = 0

  Note:SUM of the outside terms(y) and the inside terms(-6y) = -5y  

   (y-6) = 0   

   (y+1) = 0    y = -1  |Extraneous, cannot use sqrt(9)≠ -3 



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