over9000 questions thread

[Over9000]

thanks man, that helps a lot. Transformations are quite tricky and theyre easy to make mistakes in 

[cobby]

I generally try to follow the order of Dilations, Reflections and Translations when listing the transformations.
(DR.T when remembering the order)

Thanks to kurrymuncher for teaching me that process though!

[Over9000]

for transformations to get to
Do u do the same so rearrange f(x) to look like g(x) but this time you dont solve for x` and y` because its the opposite? i.e when you rearrange f(x) then its already in x` and y` format.
Is that right?

[TrueTears]

yeah this is much easier actually, you don't need to solve for x' and y', it is already in that form

[Over9000]

Thanks, I remembered my teacher telling me how to do it, but just forgot if I remembered it right

[TrueTears]

yeah DR.T is a way, but it doesn't always work.

Say you have

obviously there is a dilation of factor from the y axis.

But you wouldn't say dilation of factor from the y axis first because there is a translation of 3 units in the positive direction of x axis. So DR.T might confuse some people.

But yeah you can expand that first and then do DR.T which works out to the same anyway.

I just tend to think of the sequences the transformations are placed in.

[Over9000]

Yeh, thats right truetears, DR.T is basic and is useful for most cases but you still need to think carefully incase its a tricky question like the one you just gave.

[Over9000]

Use your graphics calculator to find the equation of the quadratic which passes through the points
I get as the equation, so how do you put that in the form
is it ??

[TrueTears]

Use your graphics calculator to find the equation of the quadratic which passes through the points
I get as the equation, so how do you put that in the form
is it ??

try completing the square

[dekoyl]

I got

And yes, completing the square.

[Over9000]

K, thanks I got it, forgot about the 2 in front when I multiplied out the -1 when completing the square, thanks TT and dekoyl

[Over9000]

solve the simultaneous equations for x, and
Can someone check my working out

[TrueTears]

i remember i did this question in your thread somewhere...?

[Over9000]

It got deleted somehow, like half the thread 

[TrueTears]

solve the simultaneous equations for x, and
Can someone check my working out

at this step

i would do this:




now just use the quadratic formula to solve for m (if i can remember it was quite a big solution )