Question

-16n^2+72n+520=0

Answer 1

do you know the quadratic formula??

Answer 2

yes

Answer 3

since, these numbers are very large to work it you could simplify it by dividing the whole equation by 4.....you could also choose to work with the numbers you have like that.....
which do you prefer??

Answer 4

i would just do the numbers i have, but do i just plug those into the formula?

Answer 5

yes....that is all you need to do....
so if you do that, what do you get for your answers??

Answer 6

i believe i am quite off, i got 236.......(non terminating decimal) i believe i am doing something wrong

Answer 7

can you post what you did??? so i can check it??

Answer 8

wait i forgot /2(a) my bad

Answer 9

okay......so now what do you get??

Answer 10

-7.48808170994, im pretty bad with this :P

Answer 11

I messaged my friend on facebook he told me to do -b/2(a) before answering, is this correct?

Answer 12

that's to get x-vertex :)

Answer 13

ah, so then i use the x vertex in the equation?

Answer 14

wait, what the original question here ? :P

Answer 15

\[x=\frac{ -72 \pm \sqrt{(72)^2-4(-16)(520)} }{ 2(-16) }\]
is that what you did??

Answer 16

i meant n not x

Answer 17

yes correct

Answer 18

so..i think the problem is coming from the calculations part....

Answer 19

alright ill try again

Answer 20

\[n=\frac{ -72 \pm \sqrt{38464} }{ -32 }\]

Answer 21

So for one of the answers I got -3.878............. is this one of the answers or close to it?

Answer 22

yes....you got it right....but do not for get its rather supposed to be -3.879

Answer 23

okay.....so what do you get for the 2nd value of n??

Answer 24

8.379.........

Answer 25

I understand it now thank you so much for your help :D

Answer 26

yw....(: