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13-02-2017
Mathematics

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The square of a number decreased by 15 is equal to twice the number. find the number

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Аноним Аноним

13-02-2017

Let, the number = n
Then, n² - 15 = 2n
n² - 2n - 15 = 0
n² + 3n - 5n - 15 = 0
n(n + 3) -5(n + 3) = 0
(n+ 3) (n - 5) = 0
n = -3 OR n = 5

In short, Your Answer would be: 5 & -3

Hope this helps!

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