Question

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

Answer 1

Any quadratic equation with a negative co-efficient for x^2 has a parabola that opens downwards.
Thus y = \[ -4x^2 + 8x - 19\] y =\[-x^2 - 6x + 10\]
are the answers