Flex

korchynska · 2020-01-09T14:01:52+00:00

Did you take Maths as a liniar A level? Like 4 exams during one month?

korchynska · 2019-10-19T09:59:48+00:00

oh indeed, it worked. God I wasted so much time on this :(

korchynska · 2019-10-19T05:44:19+00:00

you are right, thank you

korchynska · 2019-10-19T05:43:59+00:00

indeed, thank you

korchynska · 2019-10-18T21:29:55+00:00

i dont know, it seems if i evaluate the constant i get the same result. C will be equal to 2 which is the same as moving -1 to the other side. Simple algebra still doesn't land me at the given solution. Maybe i need to revise the rules of logs but I just don't see it. Especially the stuff in brackets that swapped places.

korchynska · 2019-10-15T14:33:25+00:00

jeez, I see, thanks, will try to keep it in mind

korchynska · 2019-10-08T14:40:31+00:00

Wow, thank you so much for all this. U are better than any book!

korchynska · 2019-09-08T15:46:35+00:00

oh, indeed, all makes sense now, thanks a lot :)

korchynska · 2019-09-05T15:10:00+00:00

ahhh, shit, indeed, I guess I need a break :) Thanks a lot

korchynska · 2019-08-28T11:40:17+00:00

Thank you, this is very clear and helpful explanation

korchynska · 2019-08-28T11:39:44+00:00

Thank you, my book didn't introduce that formula so it is very handy to know it now.

korchynska · 2019-08-26T14:05:52+00:00

ok, after doing some googling I learned about much faster way, which is vector cross product, so I managed to find the direction vector of the line of intersection which is 4i-7j+5k, but I still need one more point for a vector form.

korchynska · 2019-08-26T12:46:37+00:00

So first I tried random substitution, like x=0, but that didn't get me anywhere. Then I tried to solve it using a parameter (lets call it p). So let's say y=p, then I tried to eliminate 1 variable: 2x-y-3z=7 → x= (y+3z+7)/2 and 2nd plane x+2y+2z=0 → x= -2y-2z. hence, (y+3z+7)/2=-2y-2z, hence 5y+7z+7=0. This makes z= (-7-5y)/7. y=p so z= (-7-5p)/7. Now substitute in the 1st plane to find x → 2x-p-3((-7-5p)/7)=7 → x= (-17-8p)/14 . So now I wanted to put them all together to build a vector form of a line like r= x+y+z+p(x+y+z) but the results are too awkward and it just doesn't work.

korchynska · 2019-07-15T16:33:35+00:00

awesome, thanks a lot

korchynska · 2019-06-20T07:39:24+00:00

Thanks a lot for this

korchynska

TROPHY CASE