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Math Help - Two of Random Maths on algebra

  1. #1
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    Two of Random Maths on algebra

    I know these questions are basic but as I havent had a Maths lesson for about 3-4 months I obviously dont remember a great deal.

    1. I have some homework that is about Factorising. Basically the question I have is about solving the equation 'f(x)=0'

    Say I have the equation

    x-3x+1

    (x isnt muliply)

    How would I do it, I recognize the f(x)-0 but cant remember exactly what to do.


    2. I have a question on my homework that is 'Complete the table of Values for the expression x+x-2:'
    I then have a box that has: x, -2, -1, 0, 1 and 2 in seperate column and then an empty space in each row for an equation. In the space under 'x' thre is an equation:
    'x+x-2'

    I dont get what exactly I have to do.
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  2. #2
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    Quote Originally Posted by Yppolitia View Post
    I know these questions are basic but as I havent had a Maths lesson for about 3-4 months I obviously dont remember a great deal.

    1. I have some homework that is about Factorising. Basically the question I have is about solving the equation 'f(x)=0'

    Say I have the equation

    x-3x+1

    (x isnt muliply)

    How would I do it, I recognize the f(x)-0 but cant remember exactly what to do.


    2. I have a question on my homework that is 'Complete the table of Values for the expression x+x-2:'
    I then have a box that has: x, -2, -1, 0, 1 and 2 in seperate column and then an empty space in each row for an equation. In the space under 'x' thre is an equation:
    'x+x-2'

    I dont get what exactly I have to do.

    For question 2:

    You have to plug-in every value of x into equation that is given and solve that equation for that x.

    This is table you need to do:
    Attached Thumbnails Attached Thumbnails Two of Random Maths on algebra-image2.jpg  
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  3. #3
    Senior Member OReilly's Avatar
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    Quote Originally Posted by Yppolitia View Post
    I know these questions are basic but as I havent had a Maths lesson for about 3-4 months I obviously dont remember a great deal.

    1. I have some homework that is about Factorising. Basically the question I have is about solving the equation 'f(x)=0'

    Say I have the equation

    x-3x+1

    (x isnt muliply)

    How would I do it, I recognize the f(x)-0 but cant remember exactly what to do.
    Do you mean to solve for example x-3x+1 = 0?
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  4. #4
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    Quote Originally Posted by Yppolitia View Post
    I know these questions are basic but as I havent had a Maths lesson for about 3-4 months I obviously dont remember a great deal.

    1. I have some homework that is about Factorising. Basically the question I have is about solving the equation 'f(x)=0'

    Say I have the equation

    x-3x+1
    .
    You are given,
    f(x)=x-3x+1
    And you need to solve f(x)=0 (called "finding zeros").
    Thus,
    x-3x+1=0
    Apply the Quadradic Formula,

    x=[3 +/- sqrt(9-4)]/2
    Thus,
    x=[3+sqrt(5)]/2 or x=[3-sqrt(5)]/2
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