book Maths Puzzle Numerical Ability

two numbers differ by 5 and have a product of 8

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I'm really stuck on the problem if someone could answer this fo me it would be a big help
problem: divide 3a^2-a^3b-15a^2b^2+11ab^3-2b^4 by a^2+2ab-b^2 use two unit multpliers to convert 366 centimeters to feet. thanks