There are 24 sixth graders and 40 seventh graders. mr chan wants to divide both grades into groups of equal size ,with the greatest possible number of students in each group. how many students should be in each group?

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  

correct answer:

i^31 = -i