Can you guys help me ? (+)+(−+)

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

Question 5 of 10 2 points if a population is a sample of the population could be a. registered voters; all citizens o o b. baptists; all religious people o c. people who purchased shoes; all customers o d. the entire school faculty; math teachers

Which expression gives the exact value of x?