Respostas

2013-11-22T00:21:59-02:00
Y = ax² + bx + 6 

vertice

Vx = -b/2a = 5/2
Vy = f(Vx) = f(5/2) = -1/4

a*(25/4) + b*(5/2) + 6 = -1/4

25a/4 + 5b/2 + 6 = -1/4
25a + 10b + 24 = -1
25a + 10b + 25 = 0
5a + 2b + 5 = 0

-b/2a = 5/2
-2b = 10a
-b = 5a

-b + 2b + 5 = 0
b = -5
5a = 5
a = 1

y = x² - 5x + 6
4 3 4