Mathematics
23 Online
kaylak:
https://s1.postimg.org/1gonrsy65b/Capture.png
8 years ago
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kaylak:
@Vocaloid
8 years ago
kaylak:
1 horizontal to right and reflection over x axis?
8 years ago
kaylak:
@Nnesha
8 years ago
kaylak:
@Allison
8 years ago
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ThisGirlPretty:
@AshtynThatDrummerGirl @Bearclaws72 There ;p
8 years ago
kaylak:
where is she?
8 years ago
kaylak:
@Falconmaster
8 years ago
Vocaloid:
putting a negative sign outside the function reflects across the x-axis
8 years ago
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Vocaloid:
think about what |8x| looks like compared to |x|
8 years ago
kaylak:
stretched
8 years ago
Vocaloid:
we have to be careful with our terminology here
8 years ago
kaylak:
vertical
8 years ago
Vocaloid:
|dw:1507650555682:dw|
8 years ago
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kaylak:
is the second one horizontal to right and shift down 7 units
8 years ago
Vocaloid:
since the 8 is inside the absolute value sign, it must be a horizontal stretch/shrink
8 years ago
kaylak:
oh ok
8 years ago
Vocaloid:
now, if we imagine taking our graph and stretching/shrinking horizontally, then |8x| is actually a compression/shrink
8 years ago
Vocaloid:
|dw:1507650666516:dw|
8 years ago
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kaylak:
i thought it was compression when i looked at the graph
8 years ago
kaylak:
second one?
8 years ago
Vocaloid:
so for the very first problem it's a horizontal compression by 8 and a reflection across the x-axis
8 years ago
Vocaloid:
let's look at the second one then
8 years ago
Vocaloid:
f(x) = 3^x
g(x) = 3^(-x+7)
since we multiplied x by -1 (inside the function) this would be a horizontal reflection across y-axis
8 years ago
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Vocaloid:
now, we need to be careful with the + 7. intuitively you would think it would be a shift to the right, but for horizontal transformations, the direction is actually the opposite to the sign (to the left)
8 years ago
kaylak:
I've actually answered a good bit need some answers checked though
8 years ago
kaylak:
oh
8 years ago
Vocaloid:
now let's look at 25
8 years ago
kaylak:
so 21 is over y axis left?
8 years ago
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Vocaloid:
yes
8 years ago
Vocaloid:
if f(x) = x^3
and g(x) = (1/2)(x-4)^3 + 5
what transformations are being done to f(x) to get g(x)?
8 years ago
Vocaloid:
one question at a time please
8 years ago
kaylak:
horizontal right
8 years ago
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kaylak:
4 units
8 years ago
Vocaloid:
yes, left or right?
8 years ago
kaylak:
right
8 years ago
Vocaloid:
good, what else?
8 years ago
kaylak:
vertical up 5 units
8 years ago
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Vocaloid:
good, one more
8 years ago
kaylak:
compression vertically
8 years ago
Vocaloid:
good, that's it
8 years ago
kaylak:
by 2
8 years ago
Vocaloid:
|dw:1507651433678:dw|
8 years ago
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Vocaloid:
should be 1/2 I believe (could be wrong about this)
8 years ago
Vocaloid:
|dw:1507651459335:dw|
8 years ago
kaylak:
since the 1/2 is there that makes sense
8 years ago
kaylak:
i said c
8 years ago
Vocaloid:
that's not correct, try one more time
8 years ago
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kaylak:
a?
8 years ago
Vocaloid:
which interval captures those two black regions?
8 years ago
Vocaloid:
|dw:1507651585754:dw|
8 years ago
Vocaloid:
hint: it starts at negative infinity and ends at 0
8 years ago
kaylak:
so it's d
8 years ago
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Vocaloid:
good
8 years ago
Vocaloid:
gtg be back later
8 years ago
kaylak:
how long?
8 years ago
kaylak:
this one i think is c
8 years ago
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Vocaloid:
it says decreasing not increasing
8 years ago
Vocaloid:
where is the function decreasing?
8 years ago
kaylak:
-infinity -1 the one that is going downward
8 years ago
Vocaloid:
|dw:1507652517584:dw|
8 years ago
kaylak:
oh it's b because it's also at 0
8 years ago
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Vocaloid:
|dw:1507652523072:dw|
8 years ago
Vocaloid:
(-infinity,-1) is increasing not decreasing so it is not part of the solution
8 years ago
kaylak:
so a then because it is at 0
8 years ago
Vocaloid:
it's decreasing from (0,1) and (1,infinity)
yes, so A is the answer
8 years ago
kaylak:
yay this next question is on intercepts joy
8 years ago
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Vocaloid:
hint: where is the graph touching the x-axis? keep in mind the graph does not reach 0 at either extremity
8 years ago
kaylak:
-1 ?
8 years ago
Vocaloid:
|dw:1507652889258:dw|
8 years ago
Vocaloid:
|dw:1507652894725:dw|
8 years ago
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Vocaloid:
it means no intercept, yes
8 years ago
kaylak:
intercept
8 years ago
Vocaloid:
what about y-intercepts?
8 years ago
kaylak:
that's what i meant looked at next question and so the y is -1
8 years ago
kaylak:
b is answer
8 years ago
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Vocaloid:
good that's it
8 years ago
kaylak:
asymptotes next question
8 years ago
Vocaloid:
let's start with vertical
what are the vertical lines the graph approaches but does not cross?
8 years ago
kaylak:
-1 aren't both x and y -1 for asymptote
8 years ago
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Vocaloid:
no
8 years ago
Vocaloid:
|dw:1507653182180:dw|
8 years ago
Vocaloid:
|dw:1507653187974:dw|
8 years ago
kaylak:
it crosses -1 slightly i'm confused
8 years ago
Vocaloid:
the graph isn't drawn well but there's an asymptote at x = -1
8 years ago
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Vocaloid:
what about the other one?
8 years ago
kaylak:
ok that's what i thought but the you said crossed
8 years ago
kaylak:
is it -2 then?
8 years ago
Vocaloid:
??? where are you getting -2 from???
8 years ago
kaylak:
y=-2
8 years ago
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Vocaloid:
|dw:1507653433840:dw|
8 years ago
Vocaloid:
we are only talking about vertical asymptotes for now
8 years ago
kaylak:
1
8 years ago
Vocaloid:
good, so your vertical asymptotes are -1 and 1
8 years ago
Vocaloid:
let's move on to horizontal ones
8 years ago
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kaylak:
so horizontal is -2
8 years ago
Vocaloid:
|dw:1507653604064:dw|
8 years ago
kaylak:
well you said -1 wasnt right so it must be 0
8 years ago
Vocaloid:
(y = -2 is not an asymptote. I don't know how to explain this well)
8 years ago
Vocaloid:
good, y = 0
8 years ago
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Vocaloid:
those are your three asymptotes
8 years ago
kaylak:
my teacher told me to put a line straight down the sides of the y and whatever it was closest to is the asymptote
8 years ago
Vocaloid:
I guess it's possible she would want you to mark y = -2 as an asymptote
8 years ago
Vocaloid:
hint: is it symmetric about the y-axis?
8 years ago
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kaylak:
yes
8 years ago
kaylak:
so even
8 years ago
Vocaloid:
good, is it also symmetric about y = x?
8 years ago
kaylak:
i'd say so
8 years ago
Vocaloid:
|dw:1507653964266:dw|
8 years ago
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Vocaloid:
|dw:1507653970542:dw|
8 years ago
kaylak:
so neither it can't be even and odd
8 years ago
Vocaloid:
no
8 years ago
kaylak:
no
8 years ago
Vocaloid:
good
so it's symmetric about the y-axis but not y = x
so it is even, not odd
8 years ago
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Vocaloid:
there's one region where the slope is 0 (a horizontal line) can you find it?
8 years ago
kaylak:
-infinity, -4
8 years ago
Vocaloid:
good, so A
can you close this and open a new question please
8 years ago
kaylak:
so if it slopes downward it's not constant
8 years ago
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Vocaloid:
right, the slope must be 0
8 years ago