Elmarie1 Elmarie1

12-01-2016
Mathematics

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The product of two consecutive odd positive numbers is 399. Find the two numbers

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Damagician Damagician

12-01-2016

Two consecutive odd number have the form: 2n+1; 2n+3.
We have:
(2n+1)(2n+3)=399
=> 4x^2+8x+3=399
=> 4x^2+8x-396=0
=> 4(x+11)(x-9)=0
=> x=-11; x=9

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