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# Giving C4 Edexcel help watch

1. hey if any one needs C4 help with any kind of question just post it here and challenge me. Answers will be given in 24 hrs

thanks
2. (Original post by YYYY)
Hey i need help on these questions and it probablly wont challenge you but help me anyway please .

Use the substituion u=5x+3 to find an exact value for ∫ 10x/ (5x+3)^3dx... btw it has limits of 3 and 0 i just couldnt put them in there.

The second is a vectors question:

Origion 0 and points A and B have position vectors i-5j-7k and 10i+10j+5k respectively. P is a point on line AB.

a)find a vector for the line passing through A and B
b) Find the position vector of point P such that OP is perpendicular to AB
c) Dind the area of triangle OAB.

3. (Original post by jakezg)
Hey i need help on these questions and it probablly wont challenge you but help me anyway please .

Use the substituion u=5x+3 to find an exact value for ∫ 10x/ (5x+3)^3dx... btw it has limits of 3 and 0 i just couldnt put them in there.

The second is a vectors question:

Origion 0 and points A and B have position vectors i-5j-7k and 10i+10j+5k respectively. P is a point on line AB.

a)find a vector for the line passing through A and B
b) Find the position vector of point P such that OP is perpendicular to AB
c) Dind the area of triangle OAB.

u = 5x+3

the integral then becomes:

integrate that between 3 and 18.
4. he done it for me. Any more questions just post or mail me.

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Updated: June 11, 2006
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