Which bear describes the relationship between the successive terms in the sequence shown

The function models the number of accidents

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?

Write the factored form of this trinomial 9x^2+18x-7