Is the polynomial a difference of squares and if it is factor the polynomial?
y^2-16
a) is not a difference of squares
b) is a difference of squares: (y-8) (y+8)
c) is a difference of squares: (y-4)^2
d) is a difference of squares: (y-4) (y+4)

D is the answer hope it helps

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