Question

dada a função determine as coordenadas do vértice da parábola
f(x)= x² - 5x + 4

Answer 1

f(x)= x² - 5x + 4

a = 1  b= - 5   c = 4

Δ = b² - 4a.c

Δ = (5)² - 4 . 1 . 4

Δ = 25 - 16

Δ = 9

Xv = - b /2a

Xv = - (-5) /2.1

Xv = 5/2

Yv = - Δ /4a

Yv = - 9 / 4.1

Yv = - 9/4

vertices = ( Xv = 5/2 , Yv = - 9/4 )