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 = 2x^2 + 2x + 8

y = −4x^2 + 8x − 19

y = 16x^2 + 2x − 4

y = −x^2 − 6x + 10

Answer 1

1st and 4th since they have a negative x^2