solve by factorisation method
48x square-13x-1=0
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48x² - 13x - 1 = 0
48x² - (7 + 6)x - 1 = 0
48x² - 7x - 6x -1
7x(6x + 1) -1(6x + 1)
(7x - 1)(6x + 1)
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= -1/16 or 1/3........
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