Question

Choose all of the following equations that have a vertex that is the maximum point of the parabola. More than one answer may be chosen.

A. y = −4x2 + 8x − 19
B. y = −x2 − 7x + 1
C. y = 8x2 − 6x + 128
D. y = 3x2 + 9x − 4

Answer 1

ax^2+bx+c form of parabola
if a>0, parabola opens up, so it has a minimum
if a<0, parabola opens down, so it has a maximum