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Math Help - Equivalent Algebraic Expression

  1. #1
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    Equivalent Algebraic Expressions

    I'm a little confused (well more like a lot) about algebraic expressions. My teacher is a fast explainer and also a difficult one so I couldn't understand what she was saying...

    My question is, what does it mean for two algebraic expressions to be equivalent?
    And what methods are there for finding algebraic expressions that are equivalent to the ones that are given?

    A thorough explanation if possible, please~
    Last edited by aloha.world; December 14th 2008 at 11:31 PM.
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  2. #2
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    First it is simple

    First of all: It is simple to do it.
    equivalent means that they can be driven from eachother.
    for example
    (x^2-1)/(x-1) and (x+1) are equivalent
    (x-1)*(x-2) and (x^2-3x+2) are equivalent
    God bless
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  3. #3
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    Quote Originally Posted by aloha.world View Post
    I'm a little confused (well more like a lot) about algebraic expressions. My teacher is a fast explainer and also a difficult one so I couldn't understand what she was saying...

    My question is, what does it mean for two algebraic expressions to be equivalent?
    And what methods are there for finding algebraic expressions that are equivalent to the ones that are given?

    A thorough explanation if possible, please~
    Two algebraic expressions are said to be equivalent if their values obtained by substituting the values of the variables are the same. eg. 3(x + 2) and 3x + 6.
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  4. #4
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    Quote Originally Posted by samer_guirguis_2000 View Post
    First of all: It is simple to do it.
    equivalent means that they can be driven from eachother.
    for example
    (x^2-1)/(x-1) and (x+1) are equivalent Mr F says: No they aren't. There's a problem when x = 1 ....
    (x-1)*(x-2) and (x^2-3x+2) are equivalent
    God bless
    ..
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  5. #5
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    I am sorry to use such a bad example.
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