Difference equations

- anonymous

Difference equations

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- anonymous

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- anonymous

need help with checking what I have

- amistre64

5 pages?

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## More answers

- anonymous

yes! just want to check a couple and do one

- anonymous

do you know how to do #1...need to check it

- anonymous

http://www.aw-bc.com/ggts/
Ch.12 for reference

- amistre64

linear would be degree 1 that I am aware of but let me check the material

- anonymous

I have c as linear

- amistre64

c and d are both linear

- amistre64

d is not linear...

- amistre64

its got rationals in it that make it go haywire

- anonymous

ok right was seeing y sub n as exponent in denominator not just constant : (

- anonymous

gonna graph it...confused with homo and nonhom..have a and b as homo...had c too but changed

- amistre64

if you reform d it become 1 + y^2/2y and thats just a curvey mess

- amistre64

homo or nonhomo; you gotta pick all that apply? or just one?

- anonymous

all that apply -3 parts

- amistre64

the order is the difference beteen "n"s

- amistre64

a = 2nd order

- amistre64

b,c,d are all 1st orders

- anonymous

got that one...b-2 c- 1

- amistre64

b = n, n+1 .... a difference of 1; 1st order

- anonymous

ok gotcha

- amistre64

a = hom, its got a zero on the right hand side :)

- anonymous

understand that

- anonymous

looked at wrong checks only had a as homo just wanted to check that

- amistre64

i think only d is nonhomo

- amistre64

homogeneity aint my strength lol..... i guess you just need an eye for it.

- anonymous

don't understand other property other than =0 to make it hom...

- anonymous

LOL!

- anonymous

I have 2a need 2b

- anonymous

i'll try and figure2-4...how about 5 got 6 ...loved that one

- amistre64

you need 5?

- amistre64

i as trying to determine what a "complete" solution meant :)

- anonymous

yes

- anonymous

ok that is cool ; )

- anonymous

didn't want to weigh you down...

- amistre64

B(n+1) = ....

- amistre64

what level mathis this stuff anyways :)

- amistre64

B(n+1) = (.06)Bn - 25,000...so far

- anonymous

Precalculus...real-world

- amistre64

B(n+1) = (.06)Bn - 25,000(.03)n-1

- amistre64

pre calc real world eh...... you must be going to harvard or something lol

- amistre64

thats almost right in the equation...

- anonymous

i know right...UIUC in Illinois...sad part is 1-credit math module not even full course..smh

- amistre64

any idea how to get the 25000 to start at (times 1) :)
Bn+1 = (.06)Bn - 25,000(.03)

- amistre64

B(n+1) = (.06)Bn - 25,000(1+.03).....

- amistre64

B(n+1) = (.06)Bn - 25,000 + 25,000(.03)^n something like this

- amistre64

B(n+1) = (.06)Bn -25,000(1.03)^(n-1)

- anonymous

http://www.docstoc.com/docs/18298713/Planning-for-retirement

- amistre64

i got it....im sure I do :)

- amistre64

its pretty much a loan in a loan....

- amistre64

at B0; n=0

- amistre64

n=1 lol....thats it :)

- amistre64

I got the balance increaseing at .06 each time; then subtract that 25000(+.03 for interest) for the next few years

- amistre64

you agree?

- anonymous

I'm pluggin in calc. and I'm missing something

- amistre64

B(n+1) = (.06)Bn -25,000(1.03)^(n-1)
the first year we need a "0" to make that (1.03) = 1

- amistre64

\[B_{n+1}=(.06)B_{n} - 25000(1.03)^{n-1}\]

- amistre64

de we start this from n=0 or n=1?

- anonymous

got that let me keep trying

- anonymous

0

- anonymous

for the power we need n =1 so 1-1=0 and anything to 0 power is 1

- amistre64

correct

- amistre64

im writing it into a program :)

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- anonymous

neat....iterations inputed one at a time? not working

- amistre64

havent programed it ALL yet lol..let me give this a test run

- amistre64

getting warmer :)

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- amistre64

it should be 1.06 ...not .06

- amistre64

no....thats aint it ...

- anonymous

292, 250 for n=1

- amistre64

B+B(.06) = B(1.06)

- amistre64

Balance + 6% :)

- amistre64

293,000 should be it

- amistre64

300000(1.06)-25000 = 293000

- amistre64

this is it ;)

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- amistre64

forogt to change the "dressing" to 1.06 lol

- amistre64

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- amistre64

its good to go ;)

- amistre64

itll last 15 years :)

- amistre64

programming I can do ;)

- amistre64

html and javascript, we can do so much together :)

- anonymous

that is Awesome...learned a lilt programming-html but you are GREAT

- amistre64

taught meself that too ;)

- anonymous

never thought to use it...just the calc...thanks!

- amistre64

libraries shuttin down, good luck with the rest of it :)

- anonymous

ok thanks...what state are you in

- amistre64

florida ;)

- anonymous

Cool! just moved to IL from SC...ttyl

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