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@jim_thompson5910 ARE STILL THERE?

what do you have so far?

you already posted that

yea can you help me its my last question?

|dw:1436488305187:dw|

|dw:1436488324499:dw|

|dw:1436488354162:dw|

oops I meant to say "a = -1"

Part A: -1?
Part B: 44?
Part C: -384?

THATS THE ANSWERS?

a,b,c that i listed are the coefficients
not the answers

have you seen \[\Large y = ax^2 + bx + c\] before?

btw there is no part c

OH YEA MY Bad, so i need to solve that problem?

if a = -1 and b = 44
then what is \(\LARGE \frac{-b}{2a}\) equal to?

a=2 and b=2 ?

\[\Large \frac{-b}{2a} = \frac{-44}{2*(-1)} = ??\]

22?

yes, so x = 22 is where the vertex is
plug x = 22 into the original equation to find y

so whats nexts? i need to find y?

yes

|dw:1436488910837:dw|

-342?

incorrect

you should have gotten
-1*(22)^2+44(22) - 384 = 100

when x = 22, y = 100

|dw:1436489230679:dw|

oh ok, so whats next?

`What does this calculation mean in the context of the problem? `
what does the vertex tell us?

(22, 100)?

yeah what does it mean in the real world? how does it translate into english?

if you're stuck, what does x represent in this problem?

twenty-two

go back up at the top
what does it say x represents?
`where x is the...`

x = 22 ?

look at the instructions. It tells you what x means

I don't want the number

vertex?

do you see what I mean? by asking to look at the instructions

scroll to the very top of the page. You posted these instructions up there

where x is the "number of combos sold" and f(x) is the amount of profit

good

when we say
x = 22 and y = 100
that means
when 22 combos are sold, the profit is 100 dollars

oh

this is usually where managers want to aim

so that the answer for part A?

yeah all so far for A

OR THAT only one part?

we found the vertex and then gave an explanation of what it really means

ok thank you and for part B?

solve 0 = -x^2 + 44x - 384 for x
you can use technology (graphing) or the quadratic formula

part b)
solve 0 = -x^2 + 44x - 384 for x
you can use technology (graphing) or the quadratic formula

desmos is a good graphing calculator
https://www.desmos.com/calculator

type in -x^2 + 44x - 384
then look for the x intercepts

TYPE IN THE CALCULATOR?

you see where the input box is?

NO :/

OH OKAY WAIT LET ME SEE

1?

OH IN THAT CALCULATOR I DONT KNOW HOW TO PUT X^2

do you see the points (12,0) and (32,0) ?

yes

you just put in x^2 like you typed

it understands that notation

lose?

negative profit = you lost money
ie you spent more than what you made

example
you send $10 but you only make $6
so you lost $4 (6-10 = -4)

oh yea

so?

we're practically done with the problem

so thats the asnwer for part B?

more or less

ANSWER*

LESS?

huh? I don't know what you mean? I'm basically saying "yes"

OH I THINK YOU ARE ASK ME IS MORE OR LESS

ignore that portion

SO WHAT WITH NEED TO DO NOW?

WE*

you're done, the problem is over

SO WAIT THE ANSWER FOR PART B ITS: MORE OR LESS?

I already gave it to you. Just go back and re-read it

???

yeah just put that into your own words. Hopefully you understand what I mean?

IN my own words? i dont know

you can do it

no please i can please i don't speak good english

:(

Give it your best shot. Just be confident.

so wait i need to write the answer in my own?

with my own letters?

yes

thankss for you help