Question 259693
  
  If {{{(3-x)^2=25}}}, then {{{(3-x)^2 = 5^2.}}}  So (3-x)= 5.  So x = -2.  Therefore 
  {{{x^2 = -2^2 = 4.  Therefore x^2 = 4}}}  I hope this is clear to you. All the  
  best.

  =gsm=