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Mathematics 8 Online
rootbeer003:

help

rootbeer003:

hi

satellite73:

i thought we finished last night!

rootbeer003:

i still got words problems

satellite73:

you are on your own with word problems

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rootbeer003:

They arnt hard...

satellite73:

good, then you will have an easy time doing them... lets see one

rootbeer003:

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satellite73:

show your work?

satellite73:

i can't write long division here, it is a pain do you really have to show your work?

rootbeer003:

yes.. u can just write it on something else and copy and paste it as an image

rootbeer003:

wait i still got multiple choice.. lol

satellite73:

you get \[2x^3-2x-4\] with a remainder of 3 so 3x+1 is not a factor because there is a remainder

satellite73:

but i can't write or explain long division, it is just like long division with numbers

rootbeer003:

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rootbeer003:

:(

satellite73:

we did this one already

rootbeer003:

nope

satellite73:

row by column two by three

rootbeer003:

what

satellite73:

\[\huge \color{red}{2\times 3}\]

satellite73:

\[b_{42}\] fourth row, second column

rootbeer003:

a

satellite73:

let me know when you get \(-1\)

satellite73:

yes

rootbeer003:

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satellite73:

either C or D since 3 - 4 = -1 and 5 - 5 = 0

satellite73:

\[-8-(-10)=2\] so i guess C

rootbeer003:

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satellite73:

multiply each entry by \(-4\) which one do you get? hint, your really only have to multiply the first entry by -4

rootbeer003:

b

satellite73:

yes

rootbeer003:

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satellite73:

what is \[5\times (-8)+3\times 4\]?

rootbeer003:

https://www.wolframalpha.com/input/?i=5+x(-8)%2B3x4

rootbeer003:

..?

satellite73:

lol

satellite73:

just arithmetic dear, you can do it in your head

rootbeer003:

-28

rootbeer003:

a

satellite73:

yes

rootbeer003:

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satellite73:

\[4\times (-1)+2\times 0+3\times 5+8\]

rootbeer003:

19

rootbeer003:

d

satellite73:

yup

rootbeer003:

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satellite73:

no clue, lets google

satellite73:

i mean A is the only answer that makes sense, but lets google anyway

rootbeer003:

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satellite73:

yeah was A

rootbeer003:

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satellite73:

my guess is A, but that is a guess maybe more googling

rootbeer003:

and the one before is a?

satellite73:

don't you have a book or something to go along with this?

satellite73:

yeah A for both

satellite73:

i have never seen this in my life

rootbeer003:

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satellite73:

\[-30+8=-22\]

rootbeer003:

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satellite73:

i think B

rootbeer003:

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satellite73:

answer is \[2x^3-2x-4+\frac{3}{3x+1}\]

satellite73:

i..e there is a remainder of 3

rootbeer003:

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satellite73:

use wolfram

rootbeer003:

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satellite73:

i typed it in, it wasn't that hard it factored and gave me the graph too

rootbeer003:

k lemme try

rootbeer003:

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satellite73:

yay

satellite73:

you get the graph from wolf too crosses the x axis at -3 and -2

satellite73:

crosses the y axis at 36

rootbeer003:

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rootbeer003:

?

satellite73:

yeah but that doesn't look like the grid you were given to use

rootbeer003:

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rootbeer003:

can u draw it for me

satellite73:

something like this sorta

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rootbeer003:

k ty

satellite73:

make it look like the wolf graph up top here http://www.wolframalpha.com/input/?i=x%5E4%2Bx%5E3-8x%5E2%2B6x%2B36

rootbeer003:

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satellite73:

the top graph i tried, you ca probably do better

satellite73:

close enuf

rootbeer003:

yup

satellite73:

hope that is all

rootbeer003:

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rootbeer003:

lol

satellite73:

ok do you really have to show your work? i can write the steps if you like

satellite73:

it doesn't look like they left you with much room

rootbeer003:

no they left a whole page

rootbeer003:

just write here what i should write

satellite73:

\[6^{3x}=104\\ 3x=\frac{\log(104)}{\log(6)}\\ x=\frac{\log(104)}{3\log(6)}\] then a calculator

satellite73:

i get \[.864\] http://www.wolframalpha.com/input/?i=log(104)%2F(3log(6))

rootbeer003:

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satellite73:

second one \[\log(2)+\log(4x-1)=3\\ \log(8x-2)=3\\ 8x-2=10^3\\ 8x-2=1000\\ 8x=1002\\ x=1002/8=125.25\]

satellite73:

don;t forget to give a decimal answer for the first one

rootbeer003:

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satellite73:

looks good

rootbeer003:

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satellite73:

look at the top graph, make sure to select "real valued plot" otherwise you get a mess http://www.wolframalpha.com/input/?i=log_2(x-3)%2B1

satellite73:

domain is \[x>3\]

satellite73:

range is all real numbers

satellite73:

vertical asymptote is \(x=3\)

rootbeer003:

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rootbeer003:

which one

satellite73:

either one maybe the second would be better

satellite73:

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satellite73:

actually your second one is probably best

rootbeer003:

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satellite73:

no

rootbeer003:

seriously do it for me cuz it looks like a crak head did it

satellite73:

make it look like the second one

satellite73:

you can do better then me i don't even have a grid

rootbeer003:

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rootbeer003:

shexy

satellite73:

that is even worse

satellite73:

plus it is wrong

rootbeer003:

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rootbeer003:

go for it tucker

satellite73:

i like totally suck at drawing with a mouse

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rootbeer003:

magnifico

rootbeer003:

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satellite73:

yeah right

satellite73:

oh crap, it really should go through \((4,1)\) not \((4,0)\)

rootbeer003:

u gun do it again or?

satellite73:

i was trying, it is like impossible

satellite73:

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rootbeer003:

k next?

satellite73:

next what?

rootbeer003:

wanna do more?

satellite73:

time for a new thread, i have 15minutes is all

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