Question

Dada a funcao f(x)=2x²-10x+8, qual e a sua solucao?

Answer 1

Δ = -10² - 4.2.8
Δ = 100 - 64
Δ = 36

x = 10 +-√36/4
x = 10 +-6/4

x' = 10 + 6/4
x' = 16/4 = 4

x'' = 10 - 6/4
x'' = 4/4 = 1                 S = { 1 , 4 }     ok