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Aplicando diferencia de cuadrados. a² - b² = (a + b) (a - b)
1) 9x^18 - y^4
(3x^9)^2 - (y^2)^2
(3x^9 - y^2) (3x^9 + y^2)
2) a^6b^12 - c^26
(a^3b^6)^2 - (c^13)^2
(a^3b^6 + c^13) (a^3b^6 - c^13)
3) 121 - x^4y^8
(11)^2 - (x^2y^4)^2
(11 + x^2y^4) (11 - x^2y^4)