rootbeer003:
help
satellite73:
nice glasses
satellite73:
that is a load
satellite73:
\[2x^2+10x=0\] factors since each term has a common factor of \(2x\) you get \[2x(x+5)=0\]
rootbeer003:
do i delete what i put?
satellite73:
set each factor equal to zero, get \[2x=0\iff x=0\] or \[x+5=0\iff x=-5\]
satellite73:
yes it is ridiculous to use the quadratic formula in this simple case
satellite73:
looks alot better especially since you get an actual answer
WillieXO:
Hi Satellite.. Nice bysicle XD Did the whole website lagged off or was it just me xD
satellite73:
i dunno i just got here myself
WillieXO:
for this type use scatter plot and see if it is linear or non
satellite73:
successive differences means subtract
satellite73:
\[5-14=?\\ 2-5=?\\ 5-2=?\\ 15-5=?\]
WillieXO:
Or that.. LOL
satellite73:
no i made a typo last one should be \(14-5=9\)
rootbeer003:
kk
rootbeer003:
is that it?
satellite73:
oh and i forgot one
satellite73:
lets back up
rootbeer003:
ok
satellite73:
oh no i didn't sorry, those are the successive differences
rootbeer003:
thats all?
satellite73:
the pattern is clear -9 , -3, 3 , 9 that means it is a quadratic function
satellite73:
in fact it is \[f(x)=3x^2+2\] you can check it
satellite73:
i am not sure if you are supposed to know that or not
satellite73:
you could just say "it is quadratic"
satellite73:
looks good enuf to me
satellite73:
just do it
rootbeer003:
huh!
satellite73:
\[f(x)=-2x^4\\ f(-2)=-2(-2)^4\] for the first one don't be blond
satellite73:
and that is the hardest one \[f(0)=0\\ f(-1)=-2\\ f(1)=-2\] you can do the first and last ones
rootbeer003:
no i cant
satellite73:
then i guess you can't get this right
satellite73:
but of course you can probably even without a calculator, but surely with one you can compute \[-2\times (-2)^4\]
rootbeer003:
-32x
satellite73:
there is no x there
satellite73:
that was a times sign yo
satellite73:
so you have to plot the points \[(-2,-32), (-1,-2),(0,0),(1,-2),(2,-32)\]
satellite73:
put the numbers in the boxes
rootbeer003:
ok which numbers and in which box.
satellite73:
christ
satellite73:
the -32 goes in the box under the -2 etc
rootbeer003:
ok.. next
satellite73:
keep going
rootbeer003:
omg.
satellite73:
write the numbers in for the love of pete just do it
rootbeer003:
?????????????
satellite73:
what about the last one?
rootbeer003:
-2??
satellite73:
it is wrong here \[(-2,-32), (-1,-2),(0,0),(1,-2),(2,-32)\] i did it for you put the second numbers under the first numbers
rootbeer003:
why couldnt u do that at first
rootbeer003:
oh u did
rootbeer003:
im dumb sorry
satellite73:
good
rootbeer003:
thats all?
satellite73:
connect the dots maybe does it as about end behaviour?
rootbeer003:
idk
satellite73:
read it
rootbeer003:
idk what thats means
satellite73:
where the curve is pointing as x goes to infinity and to minus infinity in both cases the curve goes down to minus infinity' that is the "end behaviour"
rootbeer003:
yea it does i think
satellite73:
don't connect the dots like that on the bottom
rootbeer003:
k what do i do about end behavior thing?
satellite73:
read what i wrote above
rootbeer003:
i say that?
rootbeer003:
...?
satellite73:
or paraphrase it
rootbeer003:
no i think the question asks about our functions end behevior not the definition
satellite73:
say it goes to minus infinity that is all
satellite73:
looks good enuf
rootbeer003:
ok you know those questions i said nvm about and we dident do it? can we do it
satellite73:
if i can yes
satellite73:
i cannot do that
satellite73:
plot points if you can
rootbeer003:
well i need to do it either now and get it done or later
rootbeer003:
why cant u do it?
satellite73:
too lazy it is your job not mine it is too small it is boring i don't know how to do it so you can see it whatever whatever plot the points, the year is on the horizontal axis, the population on the vertical axis so for example plot the point \((2000,1605)\)
rootbeer003:
oh thats easy, ill plot the points then what do u do next?
satellite73:
find the slope if you can
satellite73:
looks good
rootbeer003:
ok next
rootbeer003:
how to find slope?
satellite73:
i wish i knew
satellite73:
show me again the original problem
satellite73:
looks like an increase of 800 in 10 years, slope is \(\frac{800}{10}=80\) if i read it right
satellite73:
close enuf
satellite73:
i would say "about"
rootbeer003:
ok dats it?
satellite73:
yup
satellite73:
unless htere is more
rootbeer003:
last one for tonight
satellite73:
\[x+y=5\\ .10x+.25y=1\] solve
rootbeer003:
umm x=7.5???
satellite73:
no
satellite73:
first one should be \(x+y=5\)
rootbeer003:
oh oops
rootbeer003:
looks good?
rootbeer003:
??
satellite73:
good
satellite73:
and good night
rootbeer003:
bye
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