Respostas

2013-09-23T19:29:44-03:00
ACHAR AS COORDENADAS

X(-B/2A,-DELTA/4A)

a) y=x²-x+1 = > -b/2a=1/2   e -DELTA/4A= -((-1)²-4*1*1)/4 = -3/4
 (1/2,-3/4)
b)y=2x²+7x+12 => -b/2a= -7/2*2=-7/4 e -DELTA/4A= -(7²-4*2*12)/4*2= -47/8
(-7/4,-47/8)
pronto!
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