Question

How do you know if a parabola opens up or down from equation?

Answer 1

If the x in the equation is negative or positive

Answer 2

negative it opens down
positive it opens up

Answer 3

So for something like x squared -8x+12 it would open up since x squared isn't a negative?

Answer 4

yep, and also if you search online for graphing calculators those are very useful with problems like these

Answer 5

Yea i'm on one it's just that I wasn't all that sure right now. Thanks though!