Respostas

2014-04-08T16:52:51-03:00
2³ - 7x²+3x-4 --> 8-7x² + 3x -4 --> -7x²+3x+4 .(-1) --> 7x² -3x-4
DELTA = (-3)² - 4 . 7 . (-4)
DELTA = 9 + 112
DELTA = 121

 \frac{-(-3)+/-  \sqrt{121} }{2.7}
 \frac{3 +/- 11}{14}
 x'= 1
 x"=  \frac{-4}{7}
1 1 1