Question

Ill fan all and give medal please help!! For y=-ax^2-8x+4,which value of a produces a parabola that opens upward? a.-4 b.0 c.2 d.4

Answer 1

well well.

for a parabola of std form "ax^2 + bx + c = 0", the parabola opens upward for "a>0" and downwards for "a<0". What do you think now?

Answer 2

remember though that here, your 'a' has a negative sign beside it.

Answer 3

so its a?