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Prime Factorization Help

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Well done for just crunching through the calculation the hard way, but remember in an exam, the number of marks available for a question should give you a clue how much effort is a good idea to put into a question, especially when there are other easier faster, or harder but doable and more lucrative questions to do first.

Didn't you spot the shortcut of factoring out 2^2 leaving 2^3 + 1.  I.e. 3^2?

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