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    http://www.examsolutions.net/a-level...e/paper.php#Q4

    What does part b what me to do?? i don't understand
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     |2x-5|=15+x .
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    (Original post by B_9710)
     |2x-5|=15+x .
    how do i solve something with modulus in it then??? it's new to me....
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    (Original post by bigdonger)
    how do i solve something with modulus in it then??? it's new to me....
    Solve for 2 cases:
     2x-5=\pm (15+x) .
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    (Original post by B_9710)
    Solve for 2 cases:
     2x-5=<b>\pm</b> (15+x) .
    where does that come from?
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    (Original post by bigdonger)
    how do i solve something with modulus in it then??? it's new to me....
    Two solutions:

    2x-5=15+X

    And the other
    -2x+5=15+X

    So to remember it simply, for the first solution ignore the modulus and continue as it is. For the second solution, change the signs on the two variables included in the modulus, so instead of
    +2x
    You write
    -2x
    And instead of
    -5
    You write
    +5
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    Name:  mod.png
Views: 41
Size:  34.0 KB
    (Original post by bigdonger)
    where does that come from?
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    (Original post by rxns_00)
    Two solutions:

    2x-5=15+X

    And the other
    -2x+5=15+X

    So to remember it simply, for the first solution ignore the modulus and continue as it is. For the second solution, change the signs on the two variables included in the modulus, so instead of
    +2x
    You write
    -2x
    And instead of
    -5
    You write
    +5
    (Original post by B_9710)
    Name:  mod.png
Views: 41
Size:  34.0 KB
    ah thanks both of you
 
 
 
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