Resposta :
Resposta:
x² - 8x + 2 = 0
a = 1
b = - 8
c = 2
∆ = b²-4.a.c
∆ = (-8)² - 4 . 1 . 2
∆ = 64 - 8
∆ = 56
xv = - b
------
2a
xv = -(-8)
-------
2 . 1
xv = 8
-----
2
xv = 4
yv = - ∆
-----
4a
yv = - 56
------
4 . 1
yv = -56
-----
4
yv = - 14
(4, -14)