# probability or statistics – How to find the inverse of CDF of geometric function?

The cdf of geometric distribution is given by $$F(x)=1-(1-p)^x$$.
I want to calculate the inverse of it, for example, $$F^{-1}(U)$$

I am doing the following

f(x_) := 1 – (1 – p)^x;
InverseFunction(f(u))

But I do not get anything.

my ultimate goal is to generate sample of a random variable that has geometric distribution.