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college algebra

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Let g(x) = 0.5x + 18. Write the rule for g-1(x). Then, evaluate g-1(x) at x = 20. Enter this result in the space provided.

  • college algebra -

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  • basic algebra -

    Let y = g(x) = 0.5x + 18
    0.5x = (y-18)
    x = 2y -36.
    Switch x and y for the inverse function, and x becomes the inverse function g^-1(x)

    g^-1(x) = 2x - 36
    g^-1(20) = 4

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