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

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: Q80BOY on May 07, 2009, 08:27:02 am

Title: Math P2 Oct/Nov 1999 HELP !!
Post by: Q80BOY on May 07, 2009, 08:27:02 am

IGCSE (CIE) Mathematics Paper 2 October/November 1999

(ive attched the paper)

Page 2, Question 2 (Done)

Special thanks to Sweetsh and IG Girl

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: sweetsh on May 07, 2009, 08:31:41 am

3(x + 1) >= 5 -x
3x+3 >= 5-x
3x+x >= 5-3
4x >= 2
x >= 0.5

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: AS girl on May 07, 2009, 08:33:54 am

this is ur question Solve
the inequality 3(x + 1) >= 5 -x
first expand the brackets
3x+3 >= 5-x
Put x in one side and the numbers in the other side and flip the sign
3x+x>=5-3
4x>=2
x>=2/4
x>=0.5

Which means that x is bigger or equal to 0.5 ;D

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: AS girl on May 07, 2009, 08:37:12 am

I need help with the same question paper but with no 16!!
I get mixed up when simplifying!

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: sweetsh on May 07, 2009, 08:40:56 am

16) a. 2x⁴ * 5x
= 10x⁵
     b. x²/x^0.5
=x^1.5
     c. ----
=(2x^0.5)⁶
=(2x)³
=8x³

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: AS girl on May 07, 2009, 08:49:18 am

Thanks sweetsh!!

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: Q80BOY on May 07, 2009, 08:50:29 am

i attached the mark scheme if any one needs it  ;)

Title: Re: Math P2 Oct/Nov 1999 HELP !!
Post by: sweetsh on May 07, 2009, 08:51:16 am

Good the answers are right.