Respostas

  • Usuário do Brainly
2014-07-13T22:24:41-03:00
 x^{2} + x^{} -12=0

Δ=b²-4ac

Δ=1+48

Δ=49

√Δ=7

x'= \frac{-1+7}{2} = \frac{6}{2} =3

x"= \frac{-1-7}{2} = \frac{-8}{2} =-4

S={-4,3}