Respuesta:
[tex] {x}^{2} - 10x + 25 = {x}^{2} - 2(x)(5) + {5}^{2} = {(x - 5)}^{2} [/tex]
[tex]4 {x}^{2} + 12xy + 9 {y}^{2} = {(2x)}^{2} + 2(2x)(3y) + {(3y)}^{2} = {(2x + 3y)}^{2} [/tex]
[tex] {16x}^{2} + 8xy + {y}^{2} = {(4x)}^{2} + 2(4x)(y) + {y}^{2} = {(4x + y)}^{2} [/tex]
