Question

Determine whether the graph of y = 4x2 + 5x − 8 opens up or down and whether it has a maximum or minimum point.

Up; Minimum

Up; Maximum

Down; Minimum

Down; Maximum


No clue; these questions are my weakness.

Answer 1

look at leading coefficient

Answer 2

Well, I figured out; it's downwards.

Answer 3

if it is positive, then the graph opens up
if it is negative, then the graph opens down

Answer 4

On Wolfram; it shows the graph goes down.

Answer 5

lol really

Answer 6

yes.

Answer 7

And it's min, but I learned I can't always trust wolfram on this type of question -.-

Answer 8

wolfram shows up for me hmm

Answer 9

http://www.wolframalpha.com/input/?i=y+%3D+4x2+%2B+5x+%E2%88%92+8

Answer 10

That's down?o;

Answer 11

lol its called up :)

Answer 12

that smile is called "Opens up"

Answer 13

the other way is called "Opens down"

Answer 14

Oh o: I thought it was the other way. How do i determine min and max?

Answer 15

if it opens UP, it will have MIN value

Answer 16

if it opens DOWN, it will have MAX value

Answer 17

You just helped me with all the questions like this :P