Respostas

2013-07-08T17:56:25-03:00
y = x elevado 2 -4x + 3 

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

delta = b^2 - 4 ac

delta = (-4)^2 - 4 x 1 x 3 = 16 - 12 = 4

Yv = - (delta) / 4a = -4/ 4 x 1 = -1

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y = -x elevado 2 -10x + 11 

Xv = -(-10) / 2 x (-1) = -5

delta = (-10)^2 - 4 x (-1) x 11 = 144

Yv = -144/ 4 x (-1) = 36

confere?
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