f(x) = x^3 + x + 1
What is f^-1(x)? What is f^-1(0.5)?
How would we change this equation into it's inverse? Do we solve for x such as this?
y = x^3 + x + 1
y - 1 = x(x^2 + 1)
Since (1/2, a) is a point on the graph of it follows that (a, 1/2) is a point on y = f(x).
Therefore and you're expected to use technology to solve this equation.