Question

encontre as raizes das equacoes do 2 grau incompletas

9ײ-1=0
x²+1=0
t²-121=0​

Answer 1

Resposta:

9x² - 1 = 0

Δ = 0² - 4 . 9 . (-1)

Δ = 0 + 36

Δ = 36

x = 0 ± $\sqrt{36}$ / 2 . 9

x = 0 ± 6 / 18

x' = 0 + 6 / 18

x' = 6 / 18

x' = 1/3

x'' = 0 - 6 / 18

x'' = - 6 / 18

x'' = - 1/3

x² + 1 = 0

Δ = 0² - 4 . 1 . 1

Δ = 0 - 4

Δ = - 4 (Não existem raízes reais)

t² - 121 = 0

Δ = 0² - 4 . 1 . (-121)

Δ = 0 + 484

Δ = 484

x = 0 ± $\sqrt{484}$ / 2. 1

x = 0 ± 22 / 2

x' =  0 + 22 / 2

x' = 22 / 2

x' = 11

x'' = 0 - 22 / 2

x'' = - 22 / 2

x'' = - 11