imo class 12 relations and functions

If f(x) = (4x + 3)/(6x − 4), x ≠ 2/3, then the inverse of f is:

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If f(x) = (4x + 3)/(6x − 4), x ≠ 2/3, then the inverse of f is:

  • A. (6x − 4)/(4x + 3)
  • B. f itself
  • C. (4x − 3)/(6x + 4)
  • D. Does not exist

Answer: B) f itself

Explanation: Let y = (4x + 3)/(6x − 4). Solving for x: y(6x − 4) = 4x + 3 → 6xy − 4y = 4x + 3 → x(6y − 4) = 4y + 3 → x = (4y + 3)/(6y − 4). Thus, f⁻¹(x) = (4x + 3)/(6x − 4) = f(x).

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