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Author Topic: C1 and C2 DOUBTS HERE!!!!!  (Read 98427 times)

**RoRo**

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #435 on: May 25, 2011, 04:20:29 pm »
Quote from: ang3l on May 25, 2011, 03:49:32 pm
I dont think so u need to know how to prove them, only how to apply them..and about the angles, if ur talking about the ratio/triangle thingi, i guess same is for that, just how to use it.

And Thx both of you, i understood :D

Alright, thanks! :)
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**RoRo**

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #436 on: May 25, 2011, 05:13:21 pm »
Review Exercise 1, Q21:

f(x)=x3+ax+b, where a and b are constants.

When f(x) is divided by (x?4) the remainder is 32.

When f(x) is divided by (x+2) the remainder is ?10.

(a) Find the value of a and the value of b.

(b) Show that (x?2) is a factor of f(x).

In the CD, it shows for part (a)
f(-2) = (-2)3 + (-2)a + b = 32 as well, isn't that wrong?
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Offline The Golden Girl =D

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #437 on: May 25, 2011, 05:16:49 pm »
I'm sorry I don't get which part you don't understand. *Plus what does the ? stand for *
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**RoRo**

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #438 on: May 25, 2011, 05:23:23 pm »
Quote from: ~ Miss Invisible ~ AKA GG on May 25, 2011, 05:16:49 pm
I'm sorry I don't get which part you don't understand. *Plus what does the ? stand for *


That's because I just copy pasted the question, I'm sorry, the ? stands for - [minus sign]

My question is, you need to form 2 equations, right? Speaking about part a)

The first one is 4a+b=-32
The second one, according to me should be b-2a=-2, but the CD says it's b-2a=40, because they took f(-2) to be equal to 32 instead of -10, isn't that wrong?
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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #439 on: May 25, 2011, 05:52:28 pm »
Quote from: The Secret on May 25, 2011, 05:23:23 pm
That's because I just copy pasted the question, I'm sorry, the ? stands for - [minus sign]

My question is, you need to form 2 equations, right? Speaking about part a)

The first one is 4a+b=-32
The second one, according to me should be b-2a=-2, but the CD says it's b-2a=40, because they took f(-2) to be equal to 32 instead of -10, isn't that wrong?

Since it's mentioned in the Question that it's -10 then it surely is wrong.
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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #440 on: May 25, 2011, 06:04:34 pm »
Alright, thanks! :)

Another question, Exercise 5A, Q8, Find the term independent of x in the expansion of (x2 - 2/2x)3.

What's that?  :o
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Offline iluvme

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #441 on: May 25, 2011, 06:29:07 pm »
Quote from: The Secret on May 25, 2011, 06:04:34 pm
Alright, thanks! :)

Another question, Exercise 5A, Q8, Find the term independent of x in the expansion of (x2 - 2/2x)3.

What's that?  :o

A term without x.
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**RoRo**

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #442 on: May 25, 2011, 06:35:36 pm »
Quote from: iluvme on May 25, 2011, 06:29:07 pm
A term without x.

okay, thank you! :)
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Offline iluvme

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #443 on: May 25, 2011, 06:37:16 pm »
Quote from: The Secret on May 25, 2011, 06:35:36 pm
okay, thank you! :)

Welcome. :)
You want me to do the expansion?
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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #444 on: May 25, 2011, 07:02:04 pm »
Quote from: iluvme on May 25, 2011, 06:37:16 pm
Welcome. :)
You want me to do the expansion?

I got it, you first expand the term and then you see where you can cancel the x terms and then you just get the value.
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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #445 on: May 25, 2011, 07:05:44 pm »
Quote from: The Secret on May 25, 2011, 07:02:04 pm
I got it, you first expand the term and then you see where you can cancel the x terms and then you just get the value.

Yup :)
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**RoRo**

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #446 on: May 25, 2011, 07:15:18 pm »
Quote from: iluvme on May 25, 2011, 07:05:44 pm
Yup :)

Can you please tell me how do you do this tabular method for differentiation? Or just get me a link that explains it, because it's not explained in the textbook and when I google, I'm getting Integration by parts, which is actually in C4!
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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #447 on: May 25, 2011, 07:19:59 pm »
Quote from: The Secret on May 25, 2011, 07:15:18 pm
Can you please tell me how do you do this tabular method for differentiation? Or just get me a link that explains it, because it's not explained in the textbook and when I google, I'm getting Integration by parts, which is actually in C4!

Tabular method for differentiation? Never heard of it TBH.   :-\
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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #448 on: May 25, 2011, 07:30:21 pm »
Quote from: iluvme on May 25, 2011, 07:19:59 pm
Tabular method for differentiation? Never heard of it TBH.   :-\

Check the pink box on page 153 in your C2 textbook!
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Offline iluvme

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #449 on: May 25, 2011, 07:33:21 pm »
Quote from: The Secret on May 25, 2011, 07:30:21 pm
Check the pink box on page 153 in your C2 textbook!

Don't do Edexcel.
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