Question

(ANGLO) O vértice da parábola y = 2x2 - 4x + 5 é o ponto a) (2, 5) b) (1, -3) c) (-1, 11) d) (3, 1) e) (1, 3)

Answer 1

V = (Xv, Yv)

Xv = -b/2a
Xv = -(-4)/2.2
Xv = 4/4
Xv = 1

Yv = -Δ/4a
Yv = -(b^2 - 4.a.c)/4a
Yv = -(4^2 - 4.2.5)/4a
Yv = -(16 - 40)/4a
Yv = -(-24)/4.2
Yv = 24/8
Yv = 3

(1, 3)

Alternativa E

Answer 2

2x² - 4x + 5 = y 


X do vértice -b/2a

4/4 = 1 

Y do Vertice -Δ/4a 

Δ = 16 - 4*2+5 = 16 - 40 = - 24

 24/8 = 3  

(1,3)