The square of a certain negative number is equal to 5 more than one half of the number what is the number

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The square of a certain negative number is equal to 5 more than one half of the number what is the number

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Poknoyid Poknoyid · Answer 1

the square of a certain negative number is equal to 5 more than one half of that number
what is that number
let x be that number
thus x² = x/2 + 5
   x² - x/2 - 5 = 0
   2x² - x -10 = 0
   (2x-5) (x + 2) = 0
   x = 5/2 or - 2
   so the number is - 2