« previous next »
Pages: 1 ... 3 4 [5] 6 7 ... 46   Go Down

Author Topic: C1 and C2 DOUBTS HERE!!!!!  (Read 98211 times)

Offline Blizz_rb93

  • SF Senior Citizen
  • *****
  • Posts: 815
  • Reputation: 1175
  • Gender: Male
Re: C1 DOUBTS HERE!!!!!
« Reply #60 on: May 15, 2010, 06:42:32 pm »
What's the equation to finding the length of a line ??
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: C1 DOUBTS HERE!!!!!
« Reply #61 on: May 15, 2010, 06:50:56 pm »
distance between 2 points sqrt((x_2 -x_1)^2 +(y_2 -y_1)^2)
Logged

Offline wakemeup

  • SF Immigrant
  • **
  • Posts: 72
  • Reputation: 1457
  • Gender: Male
Re: C1 DOUBTS HERE!!!!!
« Reply #62 on: May 15, 2010, 07:05:26 pm »
Quote from: vanibharutham on May 14, 2010, 05:52:14 pm
10a)

hmm

easy way to do this:

you know that the curve will cross the x-axis when y = 0
therefore, x = -3 and x = 1

You should also note that it is a cubic function

and that when x = 0 , y = 3

you know have three points

(0,3) (-3,0) and (1,0)

make sure it goes through those points and that it is cubic

here is a sketch:
http://www.wolframalpha.com/input/?i=plot+x%C2%B3+%2B+x%C2%B2+-5x+%2B+3


Ok, I got 7(d) but how exactly do you know whether the curve in 10(a) goes up then down or down then up.
« Last Edit: May 15, 2010, 07:16:20 pm by wakemeup »
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: C1 DOUBTS HERE!!!!!
« Reply #63 on: May 15, 2010, 07:16:20 pm »
For cubics if it is x^3 not -x^3 graph will be like in the link
Logged

Offline halosh92

  • SF Senior Citizen
  • *****
  • Posts: 730
  • Reputation: 1113
  • Gender: Female
    • meticulous-me
Re: C1 DOUBTS HERE!!!!!
« Reply #64 on: May 20, 2010, 02:18:51 pm »
Q2
thx :)
Logged
everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: C1 DOUBTS HERE!!!!!
« Reply #65 on: May 20, 2010, 06:43:18 pm »
Quote from: halosh92 on May 20, 2010, 02:18:51 pm
Q2
thx :)

\sum_{0}^{30}(7+2r)-\sum_{0}^{9}(7+2r)

1147-160

987

I am sure you can figure it out now.
Logged

Offline halosh92

  • SF Senior Citizen
  • *****
  • Posts: 730
  • Reputation: 1113
  • Gender: Female
    • meticulous-me
Re: C1 DOUBTS HERE!!!!!
« Reply #66 on: May 20, 2010, 06:52:09 pm »
Quote from: Engraved on May 20, 2010, 06:43:18 pm
\sum_{0}^{30}(7+2r)-\sum_{0}^{9}(7+2r)

1147-160

987

I am sure you can figure it out now.

there is my doubt exactly  ;D
why did u subtract "9" from 30 ???
thx alot ;)
Logged
everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: C1 DOUBTS HERE!!!!!
« Reply #67 on: May 20, 2010, 06:53:54 pm »
Quote from: halosh92 on May 20, 2010, 06:52:09 pm
there is my doubt exactly  ;D
why did u subtract "9" from 30 ???
thx alot ;)

It is the sum of terms 10 to 30. Inclusive of the 10th term.

Thus, you have to subtract the sum of the first 9 terms to get the answer.

I hope that answers your question.
Logged

Offline halosh92

  • SF Senior Citizen
  • *****
  • Posts: 730
  • Reputation: 1113
  • Gender: Female
    • meticulous-me
Re: C1 DOUBTS HERE!!!!!
« Reply #68 on: May 20, 2010, 07:17:31 pm »
Quote from: Engraved on May 20, 2010, 06:53:54 pm
It is the sum of terms 10 to 30. Inclusive of the 10th term.

Thus, you have to subtract the sum of the first 9 terms to get the answer.

I hope that answers your question.

so we always exclude!
thx a bunch! ;)
Logged
everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline Blizz_rb93

  • SF Senior Citizen
  • *****
  • Posts: 815
  • Reputation: 1175
  • Gender: Male
Re: C1 DOUBTS HERE!!!!!
« Reply #69 on: May 22, 2010, 09:13:28 pm »
Can someone please help me with January 2010 Question 4 and Question 6

Thank you.
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: C1 DOUBTS HERE!!!!!
« Reply #70 on: May 22, 2010, 10:22:10 pm »
jan 2010 q4 and 6
Logged

Offline Blizz_rb93

  • SF Senior Citizen
  • *****
  • Posts: 815
  • Reputation: 1175
  • Gender: Male
Re: C1 DOUBTS HERE!!!!!
« Reply #71 on: May 22, 2010, 10:41:12 pm »
Logged

Offline 7ooD

  • SF Geek
  • ****
  • Posts: 427
  • Reputation: 713
  • Gender: Male
    • 7ood
Re: C1 DOUBTS HERE!!!!!
« Reply #72 on: May 23, 2010, 01:17:19 am »
@ wakemeup look dude to find it find first where does the graph hit the x axis which are -3 and 1 but here 1 is repeated twice as it is (x-1)^2 so whenever u find square wat u do make the graph touch at that value dnt cross like others and to kno whether the graph start from up or down check if the x is positive then start from up as the graph we have in 10 a but if negative start from down
« Last Edit: May 23, 2010, 01:19:52 am by 7ood »
Logged
pimpin ain't dead it just moved to the web


Offline zabady

  • Newbie
  • *
  • Posts: 29
  • Reputation: 55
Re: C1 DOUBTS HERE!!!!!
« Reply #73 on: May 23, 2010, 01:21:10 am »
i have a doubt at jan 2008 6 c
Logged

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: C1 DOUBTS HERE!!!!!
« Reply #74 on: May 23, 2010, 05:54:41 am »
Quote from: zabady on May 23, 2010, 01:21:10 am
i have a doubt at jan 2008 6 c

a=2

Because what you have to do is simple give a function, that will map the current graph to have the maximum point in the y-axis.

This means moving the graph 2 units horizontally to the rite.

Thus, the graph is y=f(x+2)
Logged
Pages: 1 ... 3 4 [5] 6 7 ... 46   Go Up
« previous next »