Results 1 to 6 of 6
Like Tree2Likes
  • 1 Post By pikachu975
  • 1 Post By braintic

Thread: Parametrics Representations

  1. #1
    New Member
    Join Date
    Nov 2016
    HSC
    2018
    Gender
    Male
    Posts
    8
    Rep Power
    1

    Parametrics Representations

    Coming to a close to my prelim year, extension maths generally went alright but the I still don't get parametrics... any tricks to these?

    Until now I figured that there's a bunch of subsititutions to do, but how do you recognise them?

  2. #2
    Supreme Member seanieg89's Avatar
    Join Date
    Aug 2006
    HSC
    2007
    Gender
    Male
    Posts
    2,678
    Rep Power
    10

    Re: Parametrics Representations

    Can you post some examples of the sort of questions you are struggling with and your current thought process with these questions?

    This would make it much easier to help .

  3. #3
    I love trials pikachu975's Avatar
    Join Date
    May 2015
    HSC
    2017
    Gender
    Male
    Location
    NSW
    Posts
    1,957
    Rep Power
    3

    Re: Parametrics Representations

    Just do more questions parametrics is legit the same process every single time
    captainhelium likes this.
    Offering tutoring for Biology, Maths, Maths Ext 1, and Maths Ext 2.

    Solar Education - CHEAP Quality Tutoring

    Buy my books/notes cheaply here!

    --------------------------------------------------------------------------------

    2016 HSC (Accelerated): // 2U Maths (97) // SOR 1 (48) //
    2017 HSC: // English Adv // Bio // Phys // 3U Maths // 4U Maths //
    Goal: 99.8+

  4. #4
    procrastinator captainhelium's Avatar
    Join Date
    Mar 2016
    HSC
    2017
    Gender
    Male
    Location
    Kyoto, Japan
    Posts
    55
    Rep Power
    2

    Re: Parametrics Representations

    Quote Originally Posted by pikachu975 View Post
    Just do more questions parametrics is legit the same process every single time
    Yeah parametrics will pretty much ask you the same thing especially for Year 11 3U (e.g. equation of tangent, normal etc.)

    Just remember that if its a tangent or normal question to differentiate the equation and then sub in the x-coordinate of the point in question to find the gradient and then use point gradient formula from there.

    Other questions they can ask (from memory) is normally just asking you to prove that certain lines are parallel (show that they have same gradient) and that certain lines are equal (you can use distance formula). They can also ask you stuff on focal chords - just remember that pq=-1 for focal chords for your typical parabola. This is all from memory so I might be wrong.
    Providing 1 on 1 tutoring for Chemistry, Physics, Biology and 3U/4U Mathematics for $30/hr. PM me if interested!

    2017 HSC

    English Advanced · Mathematics Extension 1 · Mathematics Extension 2 · Chemistry · Physics · Biology

    Click here for cheap HSC Biology textbooks.

  5. #5
    I love trials pikachu975's Avatar
    Join Date
    May 2015
    HSC
    2017
    Gender
    Male
    Location
    NSW
    Posts
    1,957
    Rep Power
    3

    Re: Parametrics Representations

    Quote Originally Posted by captainhelium View Post
    Yeah parametrics will pretty much ask you the same thing especially for Year 11 3U (e.g. equation of tangent, normal etc.)

    Just remember that if its a tangent or normal question to differentiate the equation and then sub in the x-coordinate of the point in question to find the gradient and then use point gradient formula from there.

    Other questions they can ask (from memory) is normally just asking you to prove that certain lines are parallel (show that they have same gradient) and that certain lines are equal (you can use distance formula). They can also ask you stuff on focal chords - just remember that pq=-1 for focal chords for your typical parabola. This is all from memory so I might be wrong.
    Don't have to derive equation of a tangent it's on formula sheet.

    NOTE: make sure to state "FROM FORMULA SHEET" because some markers don't know it exists and will be like "how'd you get this"
    Offering tutoring for Biology, Maths, Maths Ext 1, and Maths Ext 2.

    Solar Education - CHEAP Quality Tutoring

    Buy my books/notes cheaply here!

    --------------------------------------------------------------------------------

    2016 HSC (Accelerated): // 2U Maths (97) // SOR 1 (48) //
    2017 HSC: // English Adv // Bio // Phys // 3U Maths // 4U Maths //
    Goal: 99.8+

  6. #6
    Exalted Member
    Join Date
    Jan 2011
    HSC
    N/A
    Gender
    Undisclosed
    Posts
    2,118
    Rep Power
    6

    Re: Parametrics Representations

    Quote Originally Posted by captainhelium View Post
    - just remember that pq=-1 for focal chords for your typical parabola.
    What a lot of people don't realise is that this is only true if you are using standard parametric equation. There have been a couple of HSC questions that have given non-standard equations. In that case, the other formulas on the sheet are also wrong.
    pikachu975 likes this.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •