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Algebra again

  • 15-02-2021 4:36pm
    #1
    dublinstudent.
    Registered Users 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 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....


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