Question 418167
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Hi
solving by completing the square 
 p^2-5p = -4 
 (p-5/2)^2 = -4 + 25/4
 (p-5/2)^2 = 9/4
 (p-5/2) = ± 3/2
   p = 5/2 ± 3/2
  p = 4 or p = 1 

CHECKING our Answer***
 p^2-5p +4 = 0
(p-4)(p-1) = 0 
(p-4)= 0   p = 4
(p-1)=0    p = 1