Question

f (x) = x² - 4x + 3

função e gráfico

Answer 1

a resposta do outro cara ta certa

Answer 2

x² - 4x + 3 = 0

a = 1    b = - 4   c= 0

Δ = b² -4ac

Δ = (-4)² - 4 . 1 . 3

Δ = 16 - 12

Δ = 4

x = -b +- √Δ  /2a

x = - (-4) +- √4 /2.1

x = 4 +- 2 /2

x' = (4 + 2) /2  =  6/2 = 3

x'' = (4 - 2)/2  = 2/2  = 1

Xv = - b/2a  = - (-4) / 2.1    = 4/2 = 2

Yv = - Δ /4a  = - 4/ 4.1  = - 4/4  = - 1