19-03-2017
Mathematics

contestada

The square of a number exceeds the number by 72. Find the number

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dsaketh dsaketh

19-03-2017

x^2 = x + 72

x^2 - (x+72) = 0

x^2 -x -72 = 0

x^2 - 9x + 8x -72 = 0

x(x-9)+8(x-9)=0

(x+8)(x-9)=0

x=9,x=-8

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