Question

x ao quadrado menos 10x - 56 = 0​

Answer 1

Resposta: 14, -4

x² - 10x - 56 =  0

Δ = (-10)² - 4.1.(-56)

Δ = 100 + 224

Δ = 324

x' = [-(-10) + √324]: 2.1

x' = [10 + 18]: 2

x' = 18:2

x' = 14

x'' = [10-18]:2

x'' = -8/2

x'' -4