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2√x< x+1 ...........kedua ruas dikuadratkan
4x < x² + 2x + 1
x² + 2x + 1 > 4x
x² - 2x + 1 > 0
(x-1)(x-1) > 0
_______+_______1_________+______
selang x = {xlx<1 atau x>1} atau {semua bilangan real memenuhi}