analytic geometry

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fin the center ,principal axis vertices, sketch the graph of 4x^-y^2 +56 x +2y+195=0

  • analytic geometry -

    let's complete the square ...
    4x^2 + 56x - (y^2 - 2y ) = -195
    4(x^2 + 14x + 49) - (y^2 - 2y + 1) = -195 + 4(49) - 1
    4(x+7)^2 - (y-1)^2 = 0

    ahh, we have a degenerated hyperbola
    the hyperbola has degenerated into its asymtotes

    notice we have a difference of squares = 0
    so
    2(x+7) + (y-1) = 0 or 2(x+7) - (y-1) = 0
    2x + 14 + y - 1 = 0 or 2x + 14 - y + 1 = 0
    2x + y = -13 or 2x - y = -15

    the "centre" would be the intersection of the two lines.

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