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Thread: Casio fx-100AU PLUS - problem using squared function with negative numbers

  1. #1
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    Casio fx-100AU PLUS - problem using squared function with negative numbers

    Hello

    I am new to doing maths and bought a CASIO fx-100AU PLUS.

    Is this a good choice? I am allowed any scientific or graphics calculator for doing calculus.

    Also I am confused, when I type in -1 squared it says -1 but -1 times -1 = 1? What am I doing wrong?

    Thank you
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  2. #2
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    Re: Casio fx-100AU PLUS - problem using squared function with negative numbers

    I don't have any first hand experience with this calculator but if as you say it says $(-1)^2 = -1$ it is either a complete piece of junk or you are using it wrong somehow.

    I kinda suspect the 2nd.

    Are you sure you're not keying in $1, (-), (x^2)$ instead of $1, (\pm), (x^2)$ ?
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  3. #3
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    Re: Casio fx-100AU PLUS - problem using squared function with negative numbers

    note that $-1^2 \ne (-1)^2$

    $-1^2 = -1 \cdot 1^2 = -1$

    $(-1)^2 = (-1)(-1) = 1$
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