Question

which equations that have a vertex that is the maximum point of the parabola.
y = −4x2 + 8x − 19

y = −x2 − 7x + 1

y = 8x2 − 6x + 128

y = 3x2 + 9x − 4

Answer 1

The first 2 I think, they have a negative coefficient of the x^2 term .