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Author Topic: IGCSE MATHS DOUBTS HERE !!!!  (Read 40448 times)

Offline moar

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #135 on: October 18, 2011, 02:28:32 pm »
Can you help me with this indices question...
Find the value of x :
(2/3)^x = 81/16
Thx in advance :)
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Offline Arthur Bon Zavi

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #136 on: October 18, 2011, 02:36:46 pm »
Quote from: moar on October 18, 2011, 02:28:32 pm
Can you help me with this indices question...
Find the value of x :
(2/3)^x = 81/16
Thx in advance :)

To remove the x from power, multiply both the sides by log.

(2/3)x = (81/16)
x * log (2/3) = log (81/16)
x = log (81/16) / log (2/3)
x = -4

Does this help ?
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Offline bro96

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Matrix Transformations
« Reply #137 on: October 24, 2011, 06:51:37 am »
Hi I'm having some problems revising for IGCSE Maths, can you please help me:
How do you find a matrix representing a transformation when given the start and finished result?
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Offline Ghost Of Highbury

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #138 on: October 24, 2011, 10:42:02 am »
how do you simplify this without using a calculator

sqrt(3) + 1 - sqrt(4+sqrt(12))
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Offline Arthur Bon Zavi

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #139 on: October 24, 2011, 10:52:04 am »
Quote from: Ghost Of Highbury on October 24, 2011, 10:42:02 am
how do you simplify this without using a calculator

sqrt(3) + 1 - sqrt(4+sqrt(12))

Seems like you are taking IGCSE Mathematics again. :P ::)
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Alpha

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #140 on: October 24, 2011, 11:49:32 am »
Quote from: Ghost Of Highbury on October 24, 2011, 10:42:02 am
how do you simplify this without using a calculator

sqrt(3) + 1 - sqrt(4+sqrt(12))

Your questions are always interesting, even after such a long time Adi!  :D
How are you, by the way? Studies and all? :)


Okay, so for this one, you just gotta find a way to arrange the expressions so that they're similar. It takes me less time to jot it down, see attachment. :)
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Offline Ghost Of Highbury

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #141 on: October 25, 2011, 07:55:02 am »
Quote from: ~Alpha on October 24, 2011, 11:49:32 am
Your questions are always interesting, even after such a long time Adi!  :D
How are you, by the way? Studies and all? :)


Okay, so for this one, you just gotta find a way to arrange the expressions so that they're similar. It takes me less time to jot it down, see attachment. :)

Haha, i'm good! What about you?

And thanks for the answer (Y)
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Offline Arthur Bon Zavi

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #142 on: October 25, 2011, 07:57:08 am »
This was a query ? I thought you were having a quiz time. :P
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Alpha

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #143 on: October 25, 2011, 11:50:34 am »
Quote from: Ghost Of Highbury on October 25, 2011, 07:55:02 am
Haha, i'm good! What about you?

And thanks for the answer (Y)

I'm good too. Having exams.  ;D

And you're welcome Adi. :)

Quote from: Arthur Bon Zavi on October 25, 2011, 07:57:08 am
This was a query ? I thought you were having a quiz time. :P

Haha! Me too, actually!  :D
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Offline imrohan

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #144 on: October 29, 2011, 02:12:41 pm »
Can i have some maths tough questions for paper 4? I'm really scared for Monday paper 4 0580! help me out with nice tough questions and some likely questions!
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Offline NotAbod

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #145 on: October 29, 2011, 05:22:55 pm »
Solve 2011 41, 42, 43.
some good questions are there.
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Offline Star xD

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #146 on: October 30, 2011, 04:54:12 pm »
I have a problem in transformations using matrices.
That is, I don't understand the I & J thing, in which we are supposed to find the matrix that shows a particular transformation.
I had no choice, so I mugged up the matrices, but am still confused if something comes that I haven't done.
I would really appreciate if someone could explain to me how to find the matrix of a particular transformation.
Also, the difference between a shear, & stretch.
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Offline NotAbod

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #147 on: October 30, 2011, 04:57:15 pm »
I and J is hard, the only way is to learn them

for shear and stretch, check attachments
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Offline Star xD

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #148 on: October 30, 2011, 05:04:03 pm »
Alright..

Thanks for the notes.

I had a doubt in Enlargement :
in my school I was taught that the co-ordinates for an enlarged object can be found by multiplying the distance of all the points of the object & the centre with the scale factor & then moving those many spaces from the centre. But on GCSE Bitesize, its just mentioned that we can just multiply the co-ordinates of the object with the scale factor to get the co-ordinates of the image. Is this only true when the centre is (0,0) or otherwise too?
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Offline NotAbod

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #149 on: October 30, 2011, 05:07:48 pm »
I use the first method, never tried the other one.
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