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    ello
    11. The curve C has equation
    y = x3 – 2x2 – x + 9, x > 0
    The point P has coordinates (2, 7).
    (a) Show that P lies on C.

    (b) Find the equation of the tangent to C at P, giving your answer in the form y = mx + c,
    where m and c are constants.

    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 the x-coordinate of Q is
    1/3(2 + √ 6 ).

    can some1 help me with C
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    Work out the equation of the tangent to C at Q first. Remember that y-y_1=(-\frac{1}{m})(x-x_1) when working out the equation for a perpendicular line.
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    What skills ahev you learned so far?

    gradients?
    evlauting equations for values?
    differentiations?

    Tell people what skills you have as suggesting you differentiate the function may mean **** all to you
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    (Original post by dexter -1)
    What skills ahev you learned so far?

    gradients?
    evlauting equations for values?
    differentiations?

    Tell people what skills you have as suggesting you differentiate the function may mean fcuk all to you
    well he's done part b so it's pretty obvious he knows how to differentiate
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    Incorrect you ******* (as to please TSR). Where has he said he has done part b?

    Have you anything to offer to the thread rather than the trash you have posted above? He has asked for part 3 which needs part B as far as I can see yet he hasnt stated whether B has been done, hence my question.
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    (Original post by dexter -1)
    Incorrect you ******* (as to please TSR). Where has he said he has done part b?
    the part where he said he needs help with c you absolute ****
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    lol....I won't continue as your argument is laughable....
    Anyway, I go back to my original point...are you going to help or just speculate?
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    (Original post by tariqsherwani)
    ello
    11. The curve C has equation
    y = x3 – 2x2 – x + 9, x > 0
    The point P has coordinates (2, 7).
    (a) Show that P lies on C.

    (b) Find the equation of the tangent to C at P, giving your answer in the form y = mx + c,
    where m and c are constants.

    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 the x-coordinate of Q is
    1/3(2 + √ 6 ).

    can some1 help me with C
    errrrgh that question is well hard... Mind You Ive done C1 and got 92 and the question of this sort did not come up. I swear this is C2 stuff. Is the exam board edexcel?
 
 
 
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