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17-09-2016
Mathematics

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the square of 9 more than a number is equal to 9 more than the square of the number. what is the number?

Respuesta :

18-09-2016

(x+9)^2 = x^2 +9
x^2 +18x + 81 = x^2 +9
18x = -72
x = -4

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