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Mathematics 9 Online
OpenStudy (firejay5):

*Problems Checked #'s 1 - 10A.* Need 10b. - the rest of packet checked* I need serious help on this packet, because I kind of get it, but at the same time I don't really understand it. I answered some of the questions which need to be checked for correctness and the ones that I don't have answers for, I need help on those. *If you need to explain each problem, so I have a better idea of what they are talking about on the packet.* *My Answers are in a PDF File, PDF File has not been updated, so answers may be off a little*

OpenStudy (firejay5):

@jim_thompson5910 sorry about this, but I need your help again, we already checked the first page, we got the 2nd - 6th page left to check.

OpenStudy (firejay5):

@jim_thompson5910 I think 10b. is 1, because if I plug in 5 into f(-x) = f(-5) = 1

jimthompson5910 (jim_thompson5910):

10b is not 1

jimthompson5910 (jim_thompson5910):

where is the max on f(x)?

OpenStudy (firejay5):

isn't it at the coordinate point (5,5)

jimthompson5910 (jim_thompson5910):

yes, so you just reflect it over the y axis to find the point where the max occurs on g(x)

OpenStudy (firejay5):

isn't it -5

jimthompson5910 (jim_thompson5910):

correct, the max on g(x) occurs at x = -5

OpenStudy (firejay5):

wow I am so stupid, I should've known that urrgggh

OpenStudy (firejay5):

10c. is reflection over y-axis

jimthompson5910 (jim_thompson5910):

10c, yeah

OpenStudy (firejay5):

11a. I have doesn't exist as first answer and -3 and 11c. is reflection over x-axis

jimthompson5910 (jim_thompson5910):

why doesn't g(-2.5) exist?

OpenStudy (firejay5):

cause if you go over to -2.5, there is nothing at -2.5

jimthompson5910 (jim_thompson5910):

remember that g(x) = f(-x)

OpenStudy (firejay5):

we are on 11. it's a different problem Let g(x) = -f(x)

jimthompson5910 (jim_thompson5910):

oh right

jimthompson5910 (jim_thompson5910):

then yeah, g(-2.5) doesn't exist

OpenStudy (firejay5):

-f(x) = 3 = -3 right

jimthompson5910 (jim_thompson5910):

11b is incorrect

OpenStudy (firejay5):

is 11b. -2 still for the min.

jimthompson5910 (jim_thompson5910):

what's the max on f(x)?

OpenStudy (firejay5):

isn't it at 5,5

jimthompson5910 (jim_thompson5910):

so the max is y = 5 you're reflecting f(x) over the x axis to get g(x) = -f(x)

jimthompson5910 (jim_thompson5910):

what is the min of g(x) ?

OpenStudy (firejay5):

-5

jimthompson5910 (jim_thompson5910):

yes

OpenStudy (firejay5):

what coordinate point would it be: (5,-5)

OpenStudy (firejay5):

right?

jimthompson5910 (jim_thompson5910):

that is correct

OpenStudy (firejay5):

so it's still at 5, but it's going down 5 units

jimthompson5910 (jim_thompson5910):

yes, since everything is flipped over the x axis

OpenStudy (firejay5):

answer is 5, okay 11c. is reflection over x-axis, 12a-c. now

OpenStudy (firejay5):

@jim_thompson5910 answer is 5 for 11b., okay 11c. is reflection over x-axis, 12a-c. now

jimthompson5910 (jim_thompson5910):

no idk why, but you changed your answer 11b isn't 5

jimthompson5910 (jim_thompson5910):

the min value is the y value that pops out of the function where it occurs is the x value

OpenStudy (firejay5):

-5

jimthompson5910 (jim_thompson5910):

yes

OpenStudy (firejay5):

question 12 now

jimthompson5910 (jim_thompson5910):

what did you get

OpenStudy (firejay5):

Does the graph on 12 all the points are shift up 2 units

jimthompson5910 (jim_thompson5910):

no

OpenStudy (firejay5):

cause I need to sketch g(x) and I want to do that first

jimthompson5910 (jim_thompson5910):

try plugging in various values of x and see what you get plug them into f(2x)

OpenStudy (firejay5):

I put y = 2x in my graphing calculator

jimthompson5910 (jim_thompson5910):

g(x) = f(2x) if x = 0, then g(x) = ??

OpenStudy (firejay5):

0

jimthompson5910 (jim_thompson5910):

correct, so we know (0,0) is on g(x)

jimthompson5910 (jim_thompson5910):

g(x) = f(2x) if x = 1, then g(x) = ??

OpenStudy (firejay5):

so each point on the f(x) will go up 2 over 1 for g(x)

jimthompson5910 (jim_thompson5910):

try it for other x values as well

OpenStudy (firejay5):

I basically plotted the line for f(2x)

jimthompson5910 (jim_thompson5910):

f(2x) isn't a complete straight line though

OpenStudy (firejay5):

I know cause I place the 7 different parent functions from page 1

jimthompson5910 (jim_thompson5910):

what do you mean?

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