Respostas

  • Usuário do Brainly
2014-05-13T18:03:22-03:00
X² + 5x = 0
a = 1
b = 5
c = 0
Δ = b² - 4ac
Δ = 5² - 4 * 1 * 0
Δ = 25 - 0
Δ = 25

x \ = \ \frac{- \ b \ \pm \ \sqrt\ \Delta}{2a} \\ \\ x \ = \ \frac{- \ 5 \ \pm \ \sqrt\ 25}{2 \ * \ 1} \\ \\ x' \ = \ \frac{- \ 5 \ + \ 5}{2} \\ \\ x' \ = \ 0 \ \div \ 2 \\ \\ x' \ = \ 0

x" \ = \ \frac{- \ 5 \ - \ 5}{2} \\ \\ x" \ = \ - \ 10 \ \div \ 2 \\ \\ x" \ = \ - \ 5 \\ \\ S \ = \{0; \ - \ 5\}