IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: holtadit on March 31, 2010, 04:54:01 pm

Title: Maths.... another one :D
Post by: holtadit on March 31, 2010, 04:54:01 pm

How would you do the last question ? Circled in purple.

Title: Re: Maths.... another one :D
Post by: @d!_†oX!© on March 31, 2010, 05:04:20 pm

Hey Ari! :D
could you scan ur answer till the second last part as well..or else i'll have to do the whole question :/

Title: Re: Maths.... another one :D
Post by: omair on March 31, 2010, 06:01:28 pm

duder just form an equation 4x+25/x2=25-3x
                               then  4x+25=25x2-3x3
                  the equation comes like this  3x3-25x2+4x+25





got it

Title: Re: Maths.... another one :D
Post by: holtadit on April 01, 2010, 10:40:17 am

Hey omair thanks man !!

But your simplification of the equation was wrong. I figured it out anyways.

+rep

Title: Re: Maths.... another one :D
Post by: haris94 on April 06, 2010, 02:48:36 pm

QUESTION :
can shear factor be a negative number? if so, how?

Title: Re: Maths.... another one :D
Post by: astarmathsandphysics on April 06, 2010, 04:14:12 pm

I think so as for scalings

Title: Re: Maths.... another one :D
Post by: haris94 on April 07, 2010, 09:58:02 am

need help in ques 2a) iv -- oct/nov 2009 paper 4
Thanks in advance

Title: Re: Maths.... another one :D
Post by: astarmathsandphysics on April 07, 2010, 10:17:17 am

1 hour

Title: Re: Maths.... another one :D
Post by: haris94 on April 07, 2010, 10:20:33 am

no probs

Title: Re: Maths.... another one :D
Post by: nid404 on April 07, 2010, 10:37:56 am

Quote from: haris94 on April 07, 2010, 09:58:02 am

need help in ques 2a) iv -- oct/nov 2009 paper 4
Thanks in advance

It's shear..

but i don;t understand how the factor is -1 cuz i got +1
Well wait for astar

Title: Re: Maths.... another one :D
Post by: astarmathsandphysics on April 07, 2010, 11:35:33 am

scaling factor 2 in the y direction

Title: Re: Maths.... another one :D
Post by: haris94 on April 09, 2010, 09:44:00 pm

ok here's a challenging question
it took me a while to solve it
pls post the answer; want to confirm my answer
Thanks

Title: Re: Maths.... another one :D
Post by: astarmathsandphysics on April 09, 2010, 11:18:35 pm

Easy. Just write the numbers the other way around like in the table then when you add up the one hundred 101's to get 10100 you are adding the same list up twice so divide by 2 to get 5050

Title: Re: Maths.... another one :D
Post by: haris94 on April 10, 2010, 09:35:31 am

yea i got that
the total of the 3rd column in the table is 2s
so i did 2s=10100

Thanks