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11 December, 10:06

If f (x) = 5x + 4, what is the inverse of f (x)

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  1. 11 December, 10:32
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    f^-1 (x) = 1/5x - 4

    To get the inverse, swap the x and y variables (f (x) becomes x, x becomes f (x)) and then solve for y again:

    x=5f (x) + 4

    x-4=5f (x)

    1/5x=f (x)
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