Respostas

  • Usuário do Brainly
2014-05-10T16:59:19-03:00
2x . (x + 3) - 5 . (x - 2) = 3
2x² + 6x - 5x + 10 = 3
2x² + 6x - 5x + 10 - 3 = 0
2x² + x + 7 = 0
Δ = b² - 4 . a . c
Δ = 1² - 4 . 2 . 7
Δ = 1 - 56
Δ = - 55

Não existe raiz real
2014-05-10T17:00:06-03:00