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2013-12-10T22:05:02-02:00
Valor mínino, Yv = 8
 Xv =  \frac{-b}{2.a}
Xv =  \frac{-(-4)}{2.1}

Xv = 2 

Yv = x² - 4.x + k
8 = 2² -4.2 + k 
k = 8 -4 + 8
k = 12
1 5 1
2013-12-11T11:10:53-02:00
X²-4(x²)+k
64-256+k=0
k=192
_________
ou si a conta for assim:
x²-4x+k
64-32+k=0
k=32