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What is the factored form of the following expressions? d^2 – 13d + 36

Two consecutive negative integers have a product of 30. what are the integers?

Let x have probability generating function gx (s) and let un generating function u(s) of the sequence uo, u1, satisfies p(x > n). show that the (1- s)u(s) = 1 - gx(s), whenever the series defining these generating functions converge.