Add me as well........ Pure science 9 subjects.
BTW i'm stuck on this add maths question.
The question is:
''If B is a root of the quadratic equation 2x^2=x+1, show that 4B^3=3B+1.''
Anyone can help me?
SPM 2013 Thread
|
|
 Dec 22 2012, 06:18 PM
|
 
Junior Member
69 posts Joined: Oct 2010 
|
|
Quote|
|
|
|
|
Dec 22 2012, 07:59 PM
|
Senior Member
3,107 posts Joined: Apr 2007 From: Sarawak 
|
QUOTE(dccldccl @ Dec 22 2012, 06:18 PM) Add me as well........ Pure science 9 subjects. solve the quad equation to find X and B = one of the X, then prove the equation.BTW i'm stuck on this add maths question. The question is: ''If B is a root of the quadratic equation 2x^2=x+1, show that 4B^3=3B+1.'' Anyone can help me?  |
|
|
Dec 22 2012, 09:24 PM
|
Senior Member
3,864 posts Joined: Dec 2009 
|
QUOTE(onelove89 @ Dec 22 2012, 07:59 PM) solve the quad equation to find X and B = one of the X, then prove the equation. I don't get the part about equating B to one of the roots of the first equation . Any hints ? Should the second cubic equation be solved also ? |
|
|
Dec 22 2012, 09:33 PM
|
Junior Member
47 posts Joined: Dec 2012
|
QUOTE(dccldccl @ Dec 22 2012, 06:18 PM) Add me as well........ Pure science 9 subjects. the answer is B=1.BTW i'm stuck on this add maths question. The question is: ''If B is a root of the quadratic equation 2x^2=x+1, show that 4B^3=3B+1.'' Anyone can help me? solve the quad equation. when you solved the quad eq. you got two roots. the root is 1 and -0.5 . substitute both roots into the 4B^3=3B+1 . you will find the answer is 1 because B=1 fits with the equation. This post has been edited by medwolf: Dec 22 2012, 09:34 PM |
|
|
Dec 22 2012, 09:52 PM
|
|
Senior Member
3,107 posts Joined: Apr 2007 From: Sarawak
|
QUOTE(medwolf @ Dec 22 2012, 09:33 PM) the answer is B=1. was hoping he'll get the answer himself ;p but yes, i got 1 too. -0.5 didn't fit.solve the quad equation. when you solved the quad eq. you got two roots. the root is 1 and -0.5 . substitute both roots into the 4B^3=3B+1 . you will find the answer is 1 because B=1 fits with the equation. |
|
|
Dec 22 2012, 09:54 PM
|
|
Senior Member
3,864 posts Joined: Dec 2009
|
QUOTE(onelove89 @ Dec 22 2012, 09:52 PM) was hoping he'll get the answer himself ;p but yes, i got 1 too. -0.5 didn't fit. The question isn't about proving the second equation ?  They want us to find the root the fits the B equation ?Added on December 22, 2012, 9:56 pm QUOTE(onelove89 @ Dec 22 2012, 09:52 PM) was hoping he'll get the answer himself ;p but yes, i got 1 too. -0.5 didn't fit. Oh I kinda got it : Since B is a root of the first equation , if 1 fits the second equation , we have shown that the second equation is indeed true . Haha . Thanks by the way .This post has been edited by maximR: Dec 22 2012, 09:56 PM |
|
|
|
|
|
Dec 22 2012, 10:55 PM
|
|
Junior Member
69 posts Joined: Oct 2010
|
QUOTE(onelove89 @ Dec 22 2012, 09:52 PM) was hoping he'll get the answer himself ;p but yes, i got 1 too. -0.5 didn't fit. Thanks for the answer.  I got it. So this question is asking about the value of B and use the value to show the qua equation right? I thought we only need to directly sub the B into the equation.  |
|
|
Dec 27 2012, 02:27 PM
|
|
Senior Member
1,138 posts Joined: Dec 2011
|
School is starting next Wednesday.
 |
|
|
Dec 27 2012, 02:28 PM
|
Senior Member
1,420 posts Joined: May 2011 From: Potato 
|
QUOTE(blueflame @ Dec 27 2012, 02:27 PM) School is starting next Wednesday. i tought tuesday? |
|
|
Dec 27 2012, 02:30 PM
|
|
Senior Member
1,138 posts Joined: Dec 2011
|
QUOTE(Calvin789 @ Dec 27 2012, 02:28 PM) i tought tuesday? Isn't Tuesday January 1st? |
|
|
Dec 27 2012, 02:31 PM
|
|
Senior Member
1,420 posts Joined: May 2011 From: Potato
|
yea... my school starts on tuesday
|
|
|
Dec 27 2012, 02:35 PM
|
|
Senior Member
1,138 posts Joined: Dec 2011
|
QUOTE(Calvin789 @ Dec 27 2012, 02:31 PM) yea... my school starts on tuesday Lulz kesian... Good luck anyway.  |
|
|
Dec 27 2012, 03:44 PM
|
Senior Member
5,648 posts Joined: Mar 2011 From: Jalan Tijani
|
Wednesday or Tuesday depends on your State IIRC.
|
|
|
|
|
|
Dec 27 2012, 04:21 PM
|
Senior Member
2,465 posts Joined: Aug 2010
|
Wow, time flies so fast and it's already close to the start of school term.. well, good luck future form 5-ers!
Oh btw, do buy Andrew Choo's tips.... cause then you'll know the things that won't come out in spm.  |
|
|
Dec 27 2012, 06:15 PM
|
|
Senior Member
499 posts Joined: Sep 2011
|
Reporting in
 Just got my textbooks and novels today. This post has been edited by superific6: Dec 27 2012, 06:16 PM |
|
|
Dec 27 2012, 09:59 PM
|
Junior Member
101 posts Joined: Aug 2012 From: Selangor
|
Add me
 Pure science subjects and no extra How's add maths/chemistry form 5 treating you all? |
|
|
Dec 27 2012, 10:20 PM
|
|
Senior Member
1,420 posts Joined: May 2011 From: Potato
|
QUOTE(andrewmky @ Dec 27 2012, 09:59 PM) Add me their behaving fine.. Physics is Pure science subjects and no extra How's add maths/chemistry form 5 treating you all?  |
|
|
Dec 27 2012, 10:36 PM
|
|
Junior Member
101 posts Joined: Aug 2012 From: Selangor
|
Hmm, Waves
 Should be interesting what, well i haven't read it thoroughly |
|
|
Dec 28 2012, 10:35 PM
|
|
Junior Member
139 posts Joined: Nov 2011
|
How do you get an A+ for physics ughhhhhhhhhhhhhhhhhhhhh or even an A. It's so complicated adfasfasfasfas KYAAA
|
|
|
Dec 28 2012, 10:46 PM
|
|
Senior Member
1,420 posts Joined: May 2011 From: Potato
|
QUOTE(assymessy @ Dec 28 2012, 10:35 PM) How do you get an A+ for physics ughhhhhhhhhhhhhhhhhhhhh or even an A. It's so complicated adfasfasfasfas KYAAA struggling here  |
|
Topic ClosedOptions
|
| Change to: |  0.0280sec
 0.79
 6 queries
 GZIP Disabled
Time is now: 13th December 2025 - 01:16 AM |
All Rights Reserved © 2002- 2025 Vijandren Ramadass (~unite against racism~)
Powered by Invision Power Board © 2025 IPS, Inc.