Quais das leis abaixo representam parábolas com concavidade voltada para cima ?
a.y= -x²+x+2 e.y= -3x²+6
b.y= 2x² f.y= -2x²+x+3
c.y= x²+4x g.y= -x²-x
d.y= x²+2x+5

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