Respostas

  • Usuário do Brainly
2014-08-26T19:45:41-03:00
X²=x+12
x²-x-12=0
a=1
b=-1
c=-12
Δ=b²-4ac
Δ=(-1)²-4(-12).1
Δ=1+48
Δ=49
√Δ=√49
√49=± 7

x=(-b ± √Δ)/2a

x'= \frac{1+7}{2} = \frac{8}{2} =4

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

S={-3,4}