Introduction to Inverse of a Function

What is the inverse function of f(x) = 3x + 9?

• (x - 9) / 3

• (x + 9) / 3

• 3x - 9

• 9x + 3

What is the inverse function of f(x) = x^2 - 4?

• sqrt(x) + 4

• sqrt(x - 4)

• +/- sqrt(x + 4)

• x^2 + 4

How can you determine if two functions, f(x) and g(x), are inverses of each other?

• By checking if f(x) + g(x) = 0.

• By checking if f(g(x)) = x and g(f(x)) = x.

• By checking if f(x) * g(x) = 1.

• By checking if f(x) = g(x).

The graphs of a function and its inverse are symmetric about which line?

• y-axis

• x-axis

• y = x

• y = -x