Author Topic: a-level math paper2 help!!  (Read 1000 times)

Offline jmarc

  • Newbie
  • *
  • Posts: 13
  • Reputation: 34
a-level math paper2 help!!
« on: May 14, 2010, 10:40:44 pm »
the parametric equations of a curve are:
            x=3t^2+1      y=6t

(i) obtain an expression, in terms of t, for the gradient of the curve and find the equation of the normal to the curve at the point with parameter 1/2

(ii)find the coordinates of the points of intersection of the curve and the straight line whose parametric equations are :
        x=T+5               y=2T-4

(b) the parametric equations of a curve are:
                      x=2cosz+ sinz,             y=cosz - 2sinz

write down expressions for 2x+y and x-2y in terms of z, hence determine the cartesian equation of the curve in its simplest form.

plzzzzzzz help asap


and to solve
   2^x=3^x-2



plzzzz help

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: a-level math paper2 help!!
« Reply #1 on: May 14, 2010, 10:41:25 pm »
I am on it

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: a-level math paper2 help!!
« Reply #2 on: May 14, 2010, 10:53:41 pm »
here

Offline jmarc

  • Newbie
  • *
  • Posts: 13
  • Reputation: 34
Re: a-level math paper2 help!!
« Reply #3 on: May 14, 2010, 11:29:30 pm »
wayzzzzzzzzzzzzzzzzzzzz Thanks alot ur like a flikin genius man!!!! Thanks agn !!!

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: a-level math paper2 help!!
« Reply #4 on: May 14, 2010, 11:30:59 pm »
Do you mean 2^x=3^x-2 or 2^x=3^(x-2)

both attachmrnts in my last post download. Can you download them both?

Offline jmarc

  • Newbie
  • *
  • Posts: 13
  • Reputation: 34
Re: a-level math paper2 help!!
« Reply #5 on: May 15, 2010, 06:39:06 pm »
Never mind I got them lolz Thanks agn and yh  the second one

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: a-level math paper2 help!!
« Reply #6 on: May 15, 2010, 06:58:50 pm »
2^x=3^(x-2)
log noth sides
x log2=(x-2)log3
xlog2=xlog3-2log3
x(log2 -log3)=-2log3
x=-2log3/(log2 -log3)