Question

Determine in which direction the parabola below opens.
y = 8x^2 - 3x - 9
a) left
b) right
c) up
d) down

please help !

Answer 1

up

Answer 2

ax^2-bx+c opens up if a is positive and down otherwise

Answer 3

hint: in general, for y = ax^2 + bx + c, the parabola will

* open up if a > 0

OR

* open down if a < 0