Is it concave or convex?

>>8829360
convex you nigger

convex

y' = 2x
y'' = 2 > 0 for all x therefore convex

File: 20170415_222443.jpg (2MB, 4160x2340px) Image search: [Google]

2MB, 4160x2340px

>>8829362
>>8829364
I thought so, but the book i was reading said concave

>>8829400

well the book is wrong

it's concave upwards

>>8829420

nobody says it like that

>>8829440
khan academy says so.

>>8829591

it's redundant

File: this makes more sense.png (19KB, 1015x479px) Image search: [Google]

19KB, 1015x479px

>>8829599
No.
Pic related makes more sense than your stupid conventional way of naming graphic properties.

>>8829663

that's literally the fucking opposite

have fun never being taken seriously with your "super special (retarded) way" of solving problems

File: anon says that convex is concave.png (29KB, 1183x479px) Image search: [Google]

29KB, 1183x479px

>>8829685
>tfw the sheeple follows blindessly the conventional way.

>>8829400
I've heard a different terminology for this before. Some books seem to refer to concavity as being either 'up' or 'down'. The curve in your post could be described as 'concave up'.

>>8829685
>>8829752
>>8829663
>>8829599

You fucking double niggers. Here is the super easy way to determine convex and concave properties.

>if the average y value of two different points is higher than the the y values in the interval the function is concave in that interval
>if the average y value is lower than the the y values in the interval the function is concave

>>8829360
>Is it concave or convex?
convex obviously

File: 016D9C4F-7188-42C3-98CB-8159E1667C08-492-0000007BAD57F09F.jpg (206KB, 1520x800px) Image search: [Google]

206KB, 1520x800px

>>8829360
>pic related

>>8829752
I'm pretty sure in italy we use this way

>>8829360
it's concave upwards

>>8829360
>spanish

Kys

>>8829400
Whats the name of this shitty book?

>>8829360
nice thread, made me reminisce. the way i was taught back in calc 1, it's "concave up"

come to think about it, we didn't talk about a 2d graph being "convex" ever, it was either "concave down" or "concave up"

>>8829440
>>8829420
That's how we said it in AP Calculus AB and BC
Unless I answered those questions wrong on the test and still got 5s

>>8832356
>we didn't talk about a 2d graph being "convex" ever, it was either "concave down" or "concave up"

because it makes much more sense and is easier to keep straight

concave up <=> convex <=> convex down
concave down <=> concave <=> convex up