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C1 HELP!

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Rozalin:
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

Rozalin:
any1?  ???

astarmathsandphysics:
Me looking now

astarmathsandphysics:
here

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

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