A=1/2ap
(40ft^2)=1/2*8*p
p=(40ft^2)/4
So for this trinomial, I will be factoring by grouping. Firstly, what two terms have a product of 16x^2 and a sum of 10x? That would be 8x and 2x. Replace 10x with 2x + 8x:

Next, factor x^2 + 2x and 8x + 16 separately. Make sure that they have the same quantity inside the parentheses: 
<u>Now you can rewrite this as
, which is your final answer.</u>
It would be 2/4. 2/4 simplifies to 1/2.
The awnser is 729 Bc 81 times 9 equals 729