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Math Help - Tangent Plane Question

  1. #1
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    Tangent Plane Question

    Let H be the hyperboloid of one sheet, given by x^2 + y^2 - z^2 = 1

    Find an equation of each plane tangent to H, which is parallel to the plane x + y -z =1.

    I get x + y + z = 1, but that's not the answer given. Did I make a mistake somewhere?
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  2. #2
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    Found my mistake, solved.
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