Choose all of the following equations that have a graph in which the parabola opens downward. More than one answer may be chosen.

y = 2x2 + 2x + 8

y = −4x2 + 8x − 19

y = 16x2 + 2x − 4

y = −x2 − 6x + 10

Question

Choose all of the following equations that have a graph in which the parabola opens downward. More than one answer may be chosen.

 y = 2x2 + 2x + 8

 y = −4x2 + 8x − 19

 y = 16x2 + 2x − 4

 y = −x2 − 6x + 10

anonymous · Answer

A parabola will open upward if the coefficient of the x^2 term is positive, and it will open downward if the coefficient of the x^2 term is negative. So, the second and fourth choices will open downward, because they have a negative coefficient on the x^2 term.

anonymous · Answer

so what r the answers

anonymous · Answer

The second and fourth answers. They have a negative 4 and negative 1, respectively, coefficients on the x^2 term.

anonymous · Answer

Oh ok thanks!

anonymous · Answer

I can't just give you the answers. Listen to @vinnv226 , we're here to teach.

anonymous · Answer

whatev

anonymous · Answer

'_' Hope "whatev" saves you on your next finals.