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x ( 9x - 4 ) = 0 x = 0 9x - 4 = 0 9x = 4 x = 4/9 S= {4,9 e 0}
9x² - 4x = 0 x . (9x - 4) = 0 x = 0 9x - 4 = 0 9x = 4 x = 4/9
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x ( 9x - 4 ) = 0 x = 0 9x - 4 = 0 9x = 4 x = 4/9 S= {4,9 e 0}
9x² - 4x = 0 x . (9x - 4) = 0 x = 0 9x - 4 = 0 9x = 4 x = 4/9