The roots of the function f (x) = x2 - 2x - 3 are shown. What is the missing number?

x = - 1 and x =

If you would like to find the roots of the function f (x) = x^2 - 2 * x - 3, you can calculate this using the following steps:

f (x) = x^2 - 2 * x - 3 = (x - 3) * (x + 1)

1. x = - 1

2. x = 3

The missing number would be 3.