3n + 9(2n – 5) = -3 n =

n = 2 im guessing

Step-by-step explanation:

3n + 9 (2n - 5) = -3n

3n + 18n - 45 = -3

21n - 45= - 3

21n = -3 + 45

21n = 42

n = 2

hope that helps and there are multiple ways to do it the way i did it was solve for n and i got 2:))

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  

answer: 1, 3 and 5 are correct

step-by-step explanation: