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so how do u find x intercepts?

x intercepts occur where y = 0

so put f(x) = 0 into ur equation and solve for x first

its easier if u factorise the equation first tho

I'm not 100% sure on how to factorise it completely

-x^2 + 48x -432
f(x) = ( -x +36 )( x - 12)

FOIL that:
( -x +36 )( x - 12)
( -x^2 +36x + 12x -432)

I think I'm overthinking it xD

I got some crazy numbers

ok... well what about this: have u ever heard of the Quadratic Formula?

Yes, but I haven't learned anything about it

12

Right?

36

perfect!
so... the hard part... what does that mean?

|dw:1438576993181:dw|

I find the vertex which is the maximum profit

|dw:1438577109879:dw|

yep, vertex = max profit... what do the x intercept indicate tho?

They're the number of games sold

* sorry 37 or more copies

Okay I understand that

cools
so what's the vertex? where do u start?

Do I substitute the x-intercepts into the equation?

No

damn... i have no idea how to help u then, sorry :(

its the only way i know how to solve

Oh I think I know!

cool, shoot

There's this formula

Is the x-coordinate 24?

yep

so what was the formula?

\[x=\frac{ -b }{ 2a }\]

never seen it before, but hey, if it works, awesome!

Mhm. I think it's wrong, but is the y-coordinate 1,296?

no, should be 144
plug x = 24 into ur equation, u should get that

Yea I did something wrong there

But I see now

Thank you so much for your help!!!

np hey, u rock at these and good lucks