Răspuns:
[tex]x^{2} - 10x + 25 = (x - 5)^{2} [/tex]
[tex]64 {x}^{2} - 16x + 1 = (8x - 1)^{2} [/tex]
Folosim formula :
[tex] {a}^{2} - 2ab + {b}^{2} = (a - b)^{2} [/tex]