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  • 14-02-2018
  • Mathematics
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Write the inverse of f(x)=1\9(x-4)^2

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sqdancefan
sqdancefan sqdancefan
  • 11-07-2018
f(x) does not pass the horizontal line test, so its inverse is not a function.

Write it as y = f(x), then interchange variables and solve for y.
  y = (1/9)(x - 4)²
  x = (1/9)(y - 4)²
  9x = (y - 4)²
  ±3√x = y - 4
  y = 4 ± 3√x

f⁻¹(x) = 4 ± 3√x
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