3 years ago

If f(x) = 2x+1/x-4, what is the value of f^-1 (3)?

1 answer:

7 0

=> y = (2x + 1) / (x - 4)
=> xy - 4y = 2x + 1 
=> xy - 2x = 4y + 1 
=> x(y - 2) = 4y + 1 
=> x = (4y + 1) / (y - 2) 
=> f-1(x) = (4x + 1) / (x - 2) 
subtitute x = 3 
=> f-1(3) = 13

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