Author Topic: c1 help plzzzzzzzzzzzz  (Read 1575 times)

Offline EVIL DOCTOR

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c1 help plzzzzzzzzzzzz
« on: January 10, 2010, 05:35:52 pm »
how can u know the coordinates that crosses the x-axis as quick as possible :

Y= (x-2)^3 - 6(x-2)^2 + 9(x-2)

Offline XFlufferzX

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Re: c1 help plzzzzzzzzzzzz
« Reply #1 on: January 10, 2010, 05:45:18 pm »
Y= (x-2)^3 - 6(x-2)^2 + 9(x-2)

solve for x

1) x = 2

2) -6x + 12
     x = 2

3) 9x - 18
     x = 2

wow all of 'em are 2 .___.
are my answers correct? :S

from where did yuh get this problem? is it from the past paper?
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Offline EVIL DOCTOR

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Re: c1 help plzzzzzzzzzzzz
« Reply #2 on: January 10, 2010, 05:48:35 pm »
thats wrong!!! 
 yes its from pastpapers!!!!!!!!!!!!!

Offline XFlufferzX

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Re: c1 help plzzzzzzzzzzzz
« Reply #3 on: January 10, 2010, 05:50:34 pm »
Oh mannnnn
which year is it? xD
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Offline XFlufferzX

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Re: c1 help plzzzzzzzzzzzz
« Reply #4 on: January 10, 2010, 05:55:54 pm »
oh its june 2009 >_< havent solved it yet
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Offline T.Q

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Re: c1 help plzzzzzzzzzzzz
« Reply #5 on: January 10, 2010, 05:56:53 pm »
how can u know the coordinates that crosses the x-axis as quick as possible :

Y= (x-2)^3 - 6(x-2)^2 + 9(x-2)

take (x-2) as a common factor
 
(x-2)( (x-2)^2-6(x-2)+9 )
 
make y=(x-2)

so the equation will be like this

y(y^2-6y+9)

factorise

then...

y=0
y=3

which means
x-2=0   and   x-2=3

x=2 or x=5
 
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Offline XFlufferzX

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Re: c1 help plzzzzzzzzzzzz
« Reply #6 on: January 10, 2010, 05:59:36 pm »
Quote
take (x-2) as a common factor
 
(x-2)( (x-2)^2-6(x-2)+9 )
 
make y=(x-2)

so the equation will be like this

y(y^2-6y+9)

factorise

then...

y=0
y=3

which means
x-2=0   and   x-2=3

x=2 or x=5
Awesooooome now I get it!  :D thx
Success is a journey, not a destination.

Offline rreizend

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Re: c1 help plzzzzzzzzzzzz
« Reply #7 on: January 10, 2010, 06:12:25 pm »
this is a horizontal translation f(x-2) where f(x)=x^3-6x^2+9x from the previous question

since its f(x-2) then you hav to add 2 to all x points. ;D

its simple really :D
« Last Edit: January 10, 2010, 06:52:48 pm by rreizend »

Offline XFlufferzX

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Re: c1 help plzzzzzzzzzzzz
« Reply #8 on: January 10, 2010, 06:34:05 pm »
Quote
this is a horizontal translation f(x-2) where f(x)=x^3-6x^2+9x from the previous question

since its f(x-2) then you hav to add 2 to all x points.

Lol riight!
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Offline Ghost Of Highbury

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Re: c1 help plzzzzzzzzzzzz
« Reply #9 on: January 11, 2010, 09:22:56 am »
wats the full form of C1..??
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Offline astarmathsandphysics

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Re: c1 help plzzzzzzzzzzzz
« Reply #10 on: January 11, 2010, 11:04:05 am »
wats the full form of C1..??

I dont understand

Offline rreizend

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Re: c1 help plzzzzzzzzzzzz
« Reply #11 on: January 11, 2010, 12:19:03 pm »
you mean as in Core Meathematics 1 ? ???

Offline Dreams <3

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Re: c1 help plzzzzzzzzzzzz
« Reply #12 on: January 11, 2010, 04:04:33 pm »
wats the full form of C1..??

Edexcel AS GCE
Core Mathematics 1  (6663)