Atrain has 6 passenger cars and each car has 4 columns of seats and each column holds 50 passengers. if one of the cars has 25 empty seats, and the rest of the cars are full, how many passengers are on the train? which of the following sets of equations correctly represents this situation?

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1