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Given the formula X=x to the power of 2 + y to the power of 2 can you find X if x=9,y=negative 4,z=1/2?

  • math -

    I see
    X = x^2 + y^2 , and x=9 , y=-4 and z = 1/2
    X = 81+16 = 97

    where does z enter the picture?

  • math -

    I Don't know, it was our teacher who typed the questions.

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