Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it? 81y4 – 16x2, a perfect square trinomial 81y4 – 16x2, the difference of squares 81y4 – 72xy2 – 16x2, a perfect square trinomial 81y4 – 72xy2 – 16x216, the difference of squares

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  

no

step-by-step explanation:

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24