Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Algebra again

  • 15-02-2021 3:36pm
    #1
    dublinstudent.
    Registered Users, Registered Users 2 Posts: 20 ✭


    So still at it. I am getting confused with algebra and lots of terms. This is a practice test, I am not looking for answers, I am looking for explanations if possible, but fear this will be very complicated.


    See Below. Thanks ( and please go easy on me)


Comments

  • #2
    bar32
    Registered Users, Registered Users 2 Posts: 59 ✭✭bar32


    Just start by whittling down what's common. All you are trying to do is to see if they can be written equivalently.

    , eg denominator of first fraction
    -18x^13y^4 - 18x^4y^7

    1. Take out the common x^4 (think it's called factorising)
    (x^4)(-18x^9y^4 - 18y^7)

    2. Take out common y^4
    (x^4)(y^4)(-18x^9 - 18y^3)

    3. Take out common -6 ( to leave +3 for answer)
    (-6).(x^4)(y^4)(3x^9 + 3y^3)

    Now what's in last brackets above looks suspiciously like the denominator in answer....do similar process with numerator and look for cancellation of terms...

    That should get you started....


Advertisement