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22-08-2017
Mathematics

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Evaluate the expression described below if the number is 4. The difference between a number squared and the number.

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22-08-2017

Hello,

[tex]x^2-x=4\\ x^2-x-4=0\\ \Delta=1^2-4*(-4)=17\\ x= \dfrac{1+ \sqrt{17} }{2} \\ or\\ x= \dfrac{1- \sqrt{17} }{2} \\ [/tex]

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