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Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
Re: Is x positive? (1) 0, on a number line, is close to x+10 than to x.
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18 Dec 2017, 08:14
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Is x positive? (1) 0, on a number line, is close to x+10 than to x. Hence mod(x+10)<mod (x) Squaring we get, x^2+20x+100<x^2 or, 20x+100<0 x <-5 hence sufficient. (2) 0, on a number line, is close to x than x-10. hence mod(x)<mod(x-10) squaring x^2<x^2-20x+100 solving , x<5 but x can be 4 or -10 hence insufficient.
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57% (01:38) correct 
