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do you know how to do this?

the x-intercept means y = 0
f(x) = 0 f(x) = profit
maximum value = highest y value = highest profit

so x-intercept means theres 0 profit?

vertex is at 3, 120 so when x = 3 y = 120
3 pens maximum profit $120

yes

ok and what about the increasing intervals?

question is asking how does y change as x changes

the more pens sold the higher the profit?

but aren't they asking for the intervals where the function is increasing and decreasing

up to the limit of 3 maximum
so x 0 to 3 increase

x more than 3 profit decrease

x more than 3 profit decrease ?

look at the graph

ohh ok

now part B

wait but what does the sale an profit represent when it increases and decreases

change in y divided by change in x
f(5) - f(3) divided by (5-3)

but what does the sale an profit represent when it increases and decreases

nvm that

but last question

what is the equation for the graph?

yes you tell me

i don't know how to make an equation for it

|dw:1439405938151:dw|

ohh ok one second

|dw:1439405998517:dw|

f(x)=(x-3)^2+120?

|dw:1439406035909:dw|

how do i find a?

@ganeshie8 can u plz help

all i need is the equation and i don't know how to get to it @welshfella

yes i did that too but i don't know ow to find a

|dw:1439406519835:dw|

f(x)=(x-0)(x-6)=0 is the equation?

hello

i don't need the zeroes though, i only need the equation itself and thats it

f(x)=(x-3)^2+120 is this the equation

well if you find the value of a you'll get the equation

no - you need to find a

AHH whats a?!?!?

0 = 9 a + 120
a = ?

-13.33?

f(x) = a(x -3)^2 + 120

yea so we have f(x) -13.333(x - 3)^2 + 120

ok thank you so much!!!!

yw

@welshfella can u give @triciaal a medal for me

ok

thanks! @welshfella

you are welcome