Mia is factoring the polynomial x2 4x - 12. she uses the steps shown. in which step did mia make an error?

First, evaluate the given polynomial X2+4X-12. We can check the error if performed complete factoring solution and compare the result to Mia's answer. We need to replace 4X with 6X-2X, the polynomial will become X2+6X-2X-12. Proceed with grouping of terms such as (X2+6X) - (2X+12). Then factor common value for each group such as the result become an X (X+6) - 2 (X+6). For the second time, we can proceed with grouping of terms such as the result become (X+6) (X-2). We can conclude that Mia is incorrect in the last step.