The roots of the function f(x) = x2 – 2x – 3 are shown. What is the missing number?
x= -1 and x =

The other root is x = 3

Step-by-step explanation:

Factor out the equation

f(x) = x² – 2x – 3

f(x) = (x + 1)(x - 3)

Set the equation equal to 0

0 = (x + 1)(x - 3)

Separate the equations

0 = (x + 1)                      0 = (x - 3)

- 1      - 1                      + 3       + 3

-1 = x                              3 = x

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