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Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by kstv » Fri Feb 26, 2010 10:35 pm
cos


x(x-2) = 0 x = 0 or 2
x(x-2) < 0 then x and x-2 should have signs (+ or -) possible within this range 0<x<2

so 0<=x<=2

x(x-2) = x² - 2 x which is always + ve for x < 0
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