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Can't use my calculator right

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    I'm loosing marks due to my dodgy calculating skills.

    Basically I'm trying to use this
    X= -2.667
    On my calculator I have to use x= 0-2.667 otherwise it throws up an error

    Anyway the equation is x^3 -4x^2+3

    The answer should be -6.481 however if I use x as a variable I always get -44.something unless I type it in exactly as this

    (0-x^3-X^2+3) AND X IS set to equal -2.667

    What am I doing wrong. The calculator is a sharp else 516 I got from america
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    Actually ignore this question I made a mistake rushing it. Cheers


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