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5a²b-5ab²-13a²b-13ab²

= -8a²b-18b²a= -2ab(4a+9b)

= -8a²b-18b²a= -2ab(4a+9b)

5ab(a-b) - 13ab(a+b)

= (5a^2b - 5ab^2) - (13a^2b + 13ab^2 )

= 5a^2b - 5ab^2 - 13a^2b - 13ab^2

= -8a^2b -18ab^2

= -2ab(4a + 9b)