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Math Help - Radical Expressions in Algebra.

  1. #1
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    Radical Expressions in Algebra.

    Take an equation:

    -a^2+2

    It's easy enough to start solving for a:

    -a^2=-2

    Now I am aware that taking the square root at this point would mean I would have to start using an imaginary number "i" as it is called. It is my understanding right now that:

    a^2=2

    is an equivalent equation to -a^2=-2 since both sides of the equation could be divided by negative one?

    I've been reviewing my algebra and so when a square root of both sides of an equation takes place I have to use a +- (plus-minus) sign?

    Is that really true in all cases?

    Thanks in advance...
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  2. #2
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    Re: Radical Expressions in Algebra.

    Quote Originally Posted by sepoto View Post
    Take an equation:
    -a^2+2
    That's not an equation; you mean this: -a^2 + 2 = 0

    Really, all it is is some cruel math teacher changed a^2 - 2 = 0 !
    Thanks from sepoto
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