Question

resolva as equacoes do segundo grau 7ao quadrado mais 13 menos 2 igual a zero

Answer 1

7x² + 13x - 2 = 0 

Δ = 169 + 56
Δ = 225

x = -13 +-√225/14
x = -13 +-15/14

x' = -13+15/14
x' = 2/14 = 1/7

x'' = -13-15/14
x'' = -28/14 = - 2                          ok