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

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: Rozalin on January 10, 2010, 08:41:00 pm

Title: C1 HELP!
Post by: Rozalin on January 10, 2010, 08:41:00 pm

Q11)
The curve C has equation

y = x^3 - 2x^2 - x + 9

The point P has co-ordinates (2,7)
a)Show that P lies on C
b)Find the equation of the tangent to c at P

The point Q also lies on C
Given that the tangent to c at Q is perpendicular to the tangent to c at P

c) Show that x-cordinate of Q is 1/3 (2+sqrt 6)

I need help in part c pleaseeee!!!!!!!!!!!!!!!
ttytytytytytyty

Title: Re: C1 HELP!
Post by: Rozalin on January 10, 2010, 09:17:26 pm

any1?  ???

Title: Re: C1 HELP!
Post by: astarmathsandphysics on January 10, 2010, 09:50:00 pm

Me looking now

Title: Re: C1 HELP!
Post by: astarmathsandphysics on January 10, 2010, 09:59:09 pm

here

Title: Re: C1 HELP!
Post by: Rozalin on January 10, 2010, 10:00:20 pm

OMIGOSH ASTAR YOU'RE MY LIFE SAVIOUR ;D THANKS ALOT!!!!!!!

Title: Re: C1 HELP!
Post by: astarmathsandphysics on January 10, 2010, 10:06:18 pm

No probs. Good luck

Title: Re: C1 HELP!
Post by: Ghost Of Highbury on January 11, 2010, 06:15:49 am

wats C1??

Title: Re: C1 HELP!
Post by: AL*Eagle on January 11, 2010, 07:39:21 am

Quote from: A@di on January 11, 2010, 06:15:49 am

wats C1??

its like Paper 1 in maths
math has different papers..
C1 C2 C3 C4
M1 M2 M3 M4
S1 etc...