Respostas

2014-08-01T00:32:49-03:00
- x^2 + 8x - 7 = 0

Delta = b^2 - 4.a.c

Delta = 64 - 4. (-1). (-7)

Delta = 64 - 28

Delta = 36

X = - b +/- raiz de delta / 2.a

X = -8 +/- 6 ÷ 2 . (-1)

X' = -14 / - 2
X' = 7

X" = -2 / -2
X" = 1