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Math Help - fractional confusion

  1. #1
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    fractional confusion

    2/3 - 15(-1/2)^2 + (-1/2)^-2

    = 2/3 - 7.5 + 1?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by x-disturbed-x
    2/3 - 15(-1/2)^2 + (-1/2)^-2

    = 2/3 - 7.5 + 1?
    (-1/2)^2\ =\ (-1/2).(-1/2)\ =\ 1/4

    (-1/2)^{-2}\ =\ (-2).(-2)\ =\ 4

    so now you should be able to complete this yourself.

    RonL
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  3. #3
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    tangents n norms

    The equation of a curve is y = 3x^2 - 2x + 1

    find the coordinates of the point R on the curve at which the gradient is -14.
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