Respostas

  • Usuário do Brainly
2014-07-10T17:07:10-03:00
X²-5x-6=0

Δ=b²-4ac
Δ=25+24
Δ=49
√Δ=7

x'= \frac{5+7}{2} = \frac{12}{2} =6

x"= \frac{5-7}{2} = \frac{-2}{2}=-1

S={-1,6}
R= letra B
2014-07-10T17:11:14-03:00
X2 - 5x - 6 = 0
Delta = (- 5) ao quadrado - 4.1.(- 6)
Delta = 25 + 24
Delta = 49

x = 5 + - raiz 49 / 2
x = 5 + - 7 / 2

x' = 5 + 7 / 2 = 12 / 2 = 6

x" = 5 - 7 / 2 = - 2 / 2 = - 1

Letra "D".