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For the function f(x)=(7-8x)^2, find f^-1. Determine whether f^-1 is a function.

  • algebra -

    it's clear that the inverse is not a function, since there are a positive and negative value for x that give the same value for y.

    y = (7-8x)^2
    ±y = 7-8x
    8x = 7±y
    x = (7±y)/8

  • algebra -


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