Question

Find the maximum or minimum of the following quadratic function: y = x2 - x - 56.
A. -56
B. 56
C. -225/4
D. 225/4
I got A

Answer 1

Find the derivative

Answer 2

ｉ　ｕｓｅ　－　Ｂ／２ａ　ｒｉｇｈｔ

Answer 3

D you know what a and b are?

Answer 4

ｙｅａｈ　ｅｑｕａｔｉｏｎ　ｉｓ　ａｘ２＋ｂｘ＋ｃ

Answer 5

Plug it in and show me what you get

Answer 6

（１／２，　５６．５）

Answer 7

ｉ　ｇｏｔ　ｉｔ　ｌｕｉｇｉ　

Answer 8

Might want to check again bud

Answer 9

ｏｈｈ　　ｉ　ｄｉｄ　－（－１）／２（１）＝１／２　
ｔｈｅｎ　ｉ　ｄｉｄ　１／２︿２－（１／２）－５６

Answer 10

Yea, so what's :
\[\Large \frac{1}{4}-\frac{1}{2}-56\]

Answer 11

１／４　－１／２　＝１／２

Answer 12

ｔｈｅｎ　ｗｏｎｔ　ｉ　ｄｏ　．５－５６？

Answer 13

Convert it to decimals if that helps:
1/4=.25
1/2=.5

So what's .25-.5

Answer 14

．２０

Answer 15

Really?
\[50-25=20?\]

Answer 16

ｏｈｈｈ　ｏｋ　ｉ　ｓｅｅ　ｓｏｒｒｙ　．２５－．５０＝．２５

Answer 17

ｉ　ｕｎｄｅｒｓｔｏｄ　．０５　ＸＤmy bad

Answer 18

Yup, and since 50 is larger than 25, it is -.25
Now, what's (-.25)+(-56.00)=?

Answer 19

-56.25

Answer 20

And there is your answer Mr Reaper

Answer 21

(1/2, -53.25)

Answer 22

*-56.25

Answer 23

and what do i do i usually get stuck here

Answer 24

What do you mean?

Answer 25

for the awnser what would i put a?

Answer 26

It'd be C, because -225/4=-56.25

Answer 27

ohhh ok i see thanks :)

Answer 28

Yup!