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Math Help - what is X

  1. #1
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    what is X

    i have a question but i have to work it out in a certain way i will do and example first.

    example

    2X +3=35

    - 3 - 3

    2X=32

    / 2 / 2
    X=16

    real question

    4(X+1)=20 i need it like the other question if u don't get how to do the workings out from above just let me know thanks alot
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  2. #2
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    Quote Originally Posted by andyboy179 View Post
    i have a question but i have to work it out in a certain way i will do and example first.

    example

    2X +3=35

    - 3 - 3

    2X=32

    / 2 / 2
    X=16

    real question

    4(X+1)=20 i need it like the other question if u don't get how to do the workings out from above just let me know thanks alot
    First go ahead and do the calculations on the left:
    4x+ 4= 20. NOW do what you did before.
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  3. #3
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    Quote Originally Posted by HallsofIvy View Post
    First go ahead and do the calculations on the left:
    4x+ 4= 20. NOW do what you did before.

    do u mean 4x + 1=20
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  4. #4
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    Quote Originally Posted by andyboy179 View Post
    do u mean 4x + 1=20
    No, I do not. The distributive law: a(b+ c)= ab+ ac. 4(x+ 1)= 4(x)+ 4(1)= 4x+ 4.

    Suppose x were equal to 2. 4(2+ 1)= 4(3)= 12 while 4(2)+ 1= 8+ 1= 9.
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  5. #5
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    Quote Originally Posted by andyboy179 View Post
    4(X+1)=20
    Divide both sides by 4.

    Subtract 1 from both sides.

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