All Junior Cert Mathematics posts
  • avatar image

    HELPPPP! sophiemk

    ive been struggling with higher level maths and dropped to ordinary some weeks before the mocks, but still didn't get the results I wanted I post a few of the questions that I get confused and if anyone knows the answers please share, thankyou:)

    Ok factorising I find so hard eg.

    4xy-6x(squared)y(squared)

    Multiplying equations....

    5(3a-4b) ????

    Like what's the difference of triangles eg scalic and icoseles

    Solve....

    Y(squared)-5y = 0

    1. avatar image

      xxhelenxx

      5(3a-4b)=

      15a-20b

      scalene triangles have sides and angle of different length and iscoseles have two sides the same length and two angles the same size

      sorry cant help you anymore than that...hope that helps-ish!

    2. avatar image

      oskar123

      5(3a-4b).....

      multiply each term in the brackets by the number outside the brackets. i.e

      5 multiplied by 3a and then 5 multiplied by 4b.

      5 multiplied by 3a= 15a..... then 5 multiplied by -4b= -20b

      so it should look like this:

      5(3a-4b)

      15a-20b

    3. avatar image

      PADMAN

      This might help

    4. avatar image

      study person

      ysquared - 5y=0 .......y is a factor of both so take y outside a bracket, y goes into ysquared y times, y goes into -5y -5 times

      y(y-5)=0 ..........let each part being multiplied (ie. y and y-5) and let them equal 0

      y=0 and y-5=0

      so y=0 or y=5

      same for your first sum, xy is a factor of both so put it outside the brackets:

      xy(4+6xy)

    5. avatar image

      study person

      Does that help??

    6. avatar image

      Dazzla16

      Hi! @study person, you made a slight mistake with your explanation, because 2xy is also factor of both 4xy and -6x^2y^2. In addition to that, you wrote +6xy when it should have been -6xy. So this is how the expression will look if it was fully factorised: 2xy(2 - 3xy).

    7. avatar image

      Dazzla16

      Hi! @study person, you made a slight mistake with your explanation, because 2xy is also a factor of both 4xy and -6x^2y^2. In addition to that, you wrote +6xy when it should have been -6xy. So this is how the expression will look if it was fully factorised: 2xy(2 - 3xy).

    8. avatar image

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