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Math Help - Do I use FOIL?

  1. #1
    Junior Member risteek's Avatar
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    Do I use FOIL?

    I have a bunch of questons but I don't know if I use FOIL in them and how to sepearte them for BEDMASS and stuff. :/

    Here is an example of one:

    (X+5)(X+4)+4(2X-2)-(3X-4)(3X+4)

    Please if you can help me with this one then I am sure I can manage through the rest. Thanks guys!
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by risteek View Post
    I have a bunch of questons but I don't know if I use FOIL in them and how to sepearte them for BEDMASS and stuff. :/

    Here is an example of one:

    (X+5)(X+4)+4(2X-2)-(3X-4)(3X+4)

    Please if you can help me with this one then I am sure I can manage through the rest. Thanks guys!
    I do believe it is called BODMAS actually.

    (x+5)(x+4)  \ \ + \ \ 4(2x-2)^2 \ \ - \ \ (3x-4)(3x+4)<br />

    (x^2 + 9x + 20)  \ \ + \ \ 4(2x-2)(2x-2) \ \ - \ \ (9x^2 - 16)<br />

    (x^2 + 9x + 20)  \ \ + \ \ 4(4x^2 - 8x + 4) \ \ - \ \ (9x^2 - 16)<br />

    (x^2 + 9x + 20)  \ \ + \ \ (16x^2 - 32x + 16) \ \ - \ \ (9x^2 - 16)<br />

    And i think you can solve from here.
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  3. #3
    GAMMA Mathematics
    colby2152's Avatar
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    Quote Originally Posted by janvdl View Post
    I do believe it is called BODMAS actually.

    (x+5)(x+4)  \ \ + \ \ 4(2x-2)^2 \ \ - \ \ (3x-4)(3x+4)<br />

    (x^2 + 9x + 20)  \ \ + \ \ 4(2x-2)(2x-2) \ \ - \ \ (9x^2 - 16)<br />

    (x^2 + 9x + 20)  \ \ + \ \ 4(4x^2 - 8x + 4) \ \ - \ \ (9x^2 - 16)<br />

    (x^2 + 9x + 20)  \ \ + \ \ (16x^2 - 32x + 16) \ \ - \ \ (9x^2 - 16)<br />

    And i think you can solve from here.
    Well, in the states, students learn expansion of two terms by the FOIL acronym. First, outside, inside, last.

    F, stands for first, or the 1st variables/numbers of (x+5)(x+4) which are x and x

    x*x + = x^2

    O, stands for outside, or the two variables/numbers on the outside, or x and 4.

    x*4 = 4x

    I, stands for inside, or the insides... 5 and x

    5*x = 5x

    L, stands for last, or the last (2nd) variables/numbers of the product of terms

    5*4 = 20

    Sum them up for the result: x^2 + 4x + 5x + 20 = x^2 + 9x + 20
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  4. #4
    Junior Member risteek's Avatar
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    Canada and the U.S use FOIL I suppose seeing as I'm Canadian

    BEDMAS:Brackets, Exponets, division/multiplication, adding/subtracting.

    Thank you guys so much =D I love this forum!
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  5. #5
    Bar0n janvdl's Avatar
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    Quote Originally Posted by risteek View Post
    Canada and the U.S use FOIL I suppose seeing as I'm Canadian

    BEDMAS:Brackets, Exponets, division/multiplication, adding/subtracting.

    Thank you guys so much =D I love this forum!
    BODMAS -> Brackets ; Of ; Div/Multi ; Add/Sub
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  6. #6
    Junior Member risteek's Avatar
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    I never heard of it that way. I will have to show my math teacher she loves different math things.
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  7. #7
    MHF Contributor Mathstud28's Avatar
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    Parentheses
    Exponents
    Multiply
    Divide
    Add
    Subtract

    "Please excuse my dear Aunt Sally"
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  8. #8
    Junior Member risteek's Avatar
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    That way sounds more... 'mature'. Thanks!
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