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

Answer 1

a negative x^2 coefficient will do that for you...

Answer 2

What?