Question

If f(x) = (1/9)(9*), what is f(3)? A. 729 B. 81 C.1/729 D.1/81​

Answer 1

• B. 81

Explanation:

Note. It is assumed * is x in the function notation.

Given

• Function f(x) = (1/9)(9ˣ)

Rewrite it as:

• f(x) = 9⁻¹ 9ˣ = 9⁻¹⁺ˣ = 9ˣ⁻¹

Find f(3)

Substitute the value of x into equation:

• f(3) = 9³⁻¹ = 9² = 81

Correct answer choice is B