Question

09. Resolva as equações incompletas:
a) x2-81=0
b) 6x2-216 = 0​

Answer 1

Resposta:

a) x² - 81 = 0

Δ = (0)² - 4 . 1 . -81

Δ = 324

x' = -0 + √324 / 2 . 1

x' = 18/2

x' = 9

x" = -0 - √324 / 2 . 1

x" = -18/2

x" = -9

b) 6x² - 216 = 0

Δ = (0)² - 4 . 6 . -216

Δ = 5184

x' = -(0) + √5184 / 2 . 6

x' = 72/12

x' = 6

x" = -(0) - √5184 / 2 . 6

x" = -72/12

x" = -6