If f of x is equal to 1 ninth x minus 2 , what is f inverse of x ?

Set y = x/9 − 2, then solve for x: y + 2 = x/9, so x = 9y + 18. Swap the variables to write the inverse: f⁻¹(x) = 9x + 18. Therefore, the correct choice is “f inverse of x is equal to 9x plus 18.”

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