Reply to an enquiry on the curve graph and its solution

• Ahm97sic

  20 Oct 12, 00:28

  Hi,

  I have recently tumbled upon ur forum post http://politics.sgforums.com/forums/2297/topics/331571

  I would like to ask how do you solve for part (j)?

  From Jundead

  To solve the part (j),

  (1)  we will use the concept curve 1 = curve 2 at the intersecting point

  (2)  Since the question says the cubic equation is satisfied by the x values of the  

        intersecting of the curve x² - x - 5 and the curve 1/x ie we can equate the two

        curves (due to the intersecting points of x).

        Hence, the required cubic equation is 

   

        x^2 - x - 5x = 1/x 

   

        x^3 - x^2 - 5x = 1

   

    

       x^3 - x^2 - 5x - 1 = 0

   

  Ver sorry for the late reply as I have not been visiting the sgforums E.Maths forum regularly.

  Thank you for your kind attention.

  Regards,

  ahm97sic