H² + 19h + 49 =n² + 8m + 16 =y² + 6y + 9 =d² + 64 - 16t =400 + 40y + y² =k² - 10k + 25 =x² + 2x + 1 =z² + 18z + 81 =20s + 100 + 5² =?

N² + 8n + 16 = (n + 4)(n + 4)

y² + 6y + 9 = (y + 3)(y + 3)

d² + 64 - 16t = ordenamos d ^ 2 - 16d + 64 = (d - 4)(d - 4)

400 + 40y + y² = y ^ 2 + 40y + 400 = (y + 20)(y + 20)

k² - 10k + 25 = (k - 5)(k - 5)

x² + 2x + 1 = (x + 1)(x + 1)

z² + 18z + 81 = (z + 9)(z + 9)

20y + 100 + 5y² = ordenamos 5y ^ 2 + 20y + 100 = ∉ solucion.