Blakhitman's Questions!

[the.watchman]

Actually I just saw a shortcut:

The final term of c(x) is

Not necessarily. The final term can also be , you have to use the factor theorem to check.

Ah, I get what you mean now!
I was working after the knowledge that x-k is a factor (but i guess factor theorem is best )

[the.watchman]

Edit

[Blakhitman]

Hey, I'm a bit stumped on this one, any help appreciated, thanks in advance!

The cross-section of a theme park ride has a central structure as shown below.




The sides of the structure can be
modelled by
The diameter of the top of the structure
is 20 m and the height of the structure is
40 m. The base of the structure has a
radius of 50 m.

(a) Find the value of a and b.

[stonecold]

did you try subbing in points (50,0) and (10,40)
and do simulanius solve?

[Blakhitman]

yeah, unless I did something wrong in the process.

[Blakhitman]

Wait what, I just did it on my cas, and got the answers...but...I did by hand and got it wrong...

hmmm oh well...

Thanks anyway!

EDIT: Got it...stupid me!

[stonecold]

i got b=-50/3
and a= 125000/3

i screwed it yeah?

[GerrySly]

i got b=-50/3
and a= 125000/3

i screwed it yeah?

One too many zeros heh

[stonecold]

^dayam!  i'll always find a way to get as close to the answer as possible without actually getting it lol..

[Blakhitman]

yup what I first tried was substitution method, i.e getting -2500b=a, then subbing to get: 4000=-2500b+b... but lol obviously didn't work, didn't think of just normal elimination ><..nee to go to bed lol...

Thanks a lot guys.

[coletrain]

did you try subbing in points (50,0) and (10,40)
and do simulanius solve?

how did you get (10,40)

[the.watchman]

The upper part of the cross section (the flat bit at the top) is 20m in diameter
So each side has x-coordinates -10 and 10, also, it is 40m high, so the y-coordinate of both points is 40

[coletrain]

thanks

[the.watchman]

thanks

No prob, worded questions are harder to interpret

[Blakhitman]

Thanks!