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28-12-2017
Mathematics

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When isaac opens a book, the product of the page nuumbers on the open pages is 420?

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lesliekolleroxrkcf lesliekolleroxrkcf

28-12-2017

x(x+1)=420

x²+x-420=0

(x+21)(x-20 )=420

x = -21 or +20. since we don't use negative page numbers discard -21 and let x be 20. the 2 pages are thus 20 and 21

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