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Author Topic: IGCSE Maths doubt(paper 4)  (Read 14246 times)

Offline Ghost Of Highbury

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Re: IGCSE Maths doubt(paper 4)
« Reply #45 on: November 01, 2009, 02:54:48 pm »
Quote from: nid404 on November 01, 2009, 02:52:49 pm
Gradient formula should be used for the second 1....but for the first one i think we need to used distance formula....they did something else.....

so aadi....could u use the distance formula FOR the first one ??

@alpha-i know he asked for the 2nd one ans I know the stuff.....I was asking abt the first part cuz I used the distance formula for the first one and got a different answer

which distance formula?
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nid404

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Re: IGCSE Maths doubt(paper 4)
« Reply #46 on: November 01, 2009, 02:58:02 pm »
Quote from: A@di on November 01, 2009, 02:54:48 pm
which distance formula?

arree

root of (x+x1)2+(y+y1)2=AB
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Offline Ghost Of Highbury

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Re: IGCSE Maths doubt(paper 4)
« Reply #47 on: November 01, 2009, 03:05:15 pm »
Quote from: nid404 on November 01, 2009, 02:58:02 pm
arree

root of (x+x1)2+(y+y1)2=AB

its sqrt((x_2 - x_1)^2 + (y_2-y_1)^2)
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nid404

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Re: IGCSE Maths doubt(paper 4)
« Reply #48 on: November 01, 2009, 03:16:54 pm »
Quote from: A@di on November 01, 2009, 03:05:15 pm
its sqrt((x_2 - x_1)^2 + (y_2-y_1)^2)

srry yaa yaa.....haste haste :P :P

why can't u use tht??
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Offline Ghost Of Highbury

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Re: IGCSE Maths doubt(paper 4)
« Reply #49 on: November 01, 2009, 03:26:07 pm »
Quote from: nid404 on November 01, 2009, 03:16:54 pm
srry yaa yaa.....haste haste :P :P

why can't u use tht??

i used that re..

first find the vector..and use that formula..bas!
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Alpha

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Re: IGCSE Maths doubt(paper 4)
« Reply #50 on: November 01, 2009, 03:30:17 pm »
Quote from: nid404 on November 01, 2009, 02:52:49 pm
Gradient formula should be used for the second 1....but for the first one i think we need to used distance formula....they did something else.....

so aadi....could u use the distance formula FOR the first one ??

@alpha-i know he asked for the 2nd one ans I know the stuff.....I was asking abt the first part cuz I used the distance formula for the first one and got a different answer

k = 26...

Which answer you got??

There are 2 answers... k = - 14 and k = 26.

-14 is negative; rejected.
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nid404

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Re: IGCSE Maths doubt(paper 4)
« Reply #51 on: November 01, 2009, 03:31:13 pm »
so u get k=26 right........cuz the toxic guy sot something else
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Offline ~~~~shreyapril~~~~

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Re: IGCSE Maths doubt(paper 4)
« Reply #52 on: November 01, 2009, 04:51:33 pm »
hmm...
to spell beans over your hard work i would like to tell you all tat answer is 16!!!

so how to get 16????
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Offline Ghost Of Highbury

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Re: IGCSE Maths doubt(paper 4)
« Reply #53 on: November 01, 2009, 04:52:31 pm »
Quote from: ~~~~shreycool~~~~ on November 01, 2009, 04:51:33 pm
hmm...
to spell beans over your hard work i would like to tell you all tat answer is 16!!!

so how to get 16????

didnt i answer it
?
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Offline Ghost Of Highbury

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Re: IGCSE Maths doubt(paper 4)
« Reply #54 on: November 01, 2009, 04:53:23 pm »
Quote from: A@di on October 31, 2009, 03:00:39 pm
ok..

first. --> AB=OB - OA = 4i + 6j

--> BC = OC - OB = (k-6)i + 15j

BC = x(AB)

(k-6)i + 15j = 4xi + 6xj

k-6 = 4x
6x = 15

x = 2.5

--

k-6 = 4*2.5 = 10

therefore --> k =16


check this
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Offline ~~~~shreyapril~~~~

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Re: IGCSE Maths doubt(paper 4)
« Reply #55 on: November 01, 2009, 04:54:23 pm »
so what 26 was nodhi and alpha talking abt???
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nid404

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Re: IGCSE Maths doubt(paper 4)
« Reply #56 on: November 01, 2009, 04:55:11 pm »
Quote from: ~~~~shreycool~~~~ on November 01, 2009, 04:54:23 pm
so what 26 was nodhi and alpha talking abt???

the first part
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Alpha

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Re: IGCSE Maths doubt(paper 4)
« Reply #57 on: November 02, 2009, 04:59:24 am »
Quote from: ~~~~shreycool~~~~ on November 01, 2009, 04:54:23 pm
so what 26 was nodhi and alpha talking abt???


The first part! I already answered the second part...
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Alpha

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Re: IGCSE Maths doubt(paper 4)
« Reply #58 on: November 02, 2009, 05:04:22 am »
Quote from: ~Alpha on October 31, 2009, 02:23:55 pm

If ABC is a str. line,

     AB = hBC, where h is a constant.

AB= OB- OA

BC = OC - OB

Continues in the attachment... I allways have problem explaining answers here... Formatting is confusing... Anyway, see the attachment.


Here: Reposted.
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Alpha

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Re: IGCSE Maths doubt(paper 4)
« Reply #59 on: November 02, 2009, 05:11:44 am »
Here is the attachment... Distance formula.
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