Explain the difference in meaning between 8+6 divided by 2 and 8 divided by 6 divided by 2

In first case it is (8+6) whole divided by 2 that is 8/2+6/2 where u will get the answer 7.

in next case it is (8/6) then divided by 2

which will be 8/6*1/2.

(while converting from division to multiplication remember to take the reciprocal of the number after division sign in this 2 will become 1/2)

so and will be 8/12. 2/3 will be the answer

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