You combine the like terms to get
2s^2y^2-4a^2sy+2a^4
Answer:

Step-by-step explanation:

You need to complete the square on the right side.







Act like it's a whole circle and find the perimeter, then divide by 2.
P = 2 * pi * r
P = 2 * 3.14 * 9
P = 56.52
Now divide by 2:
P = 28.26
Answer:
k= 9
Step-by-step explanation:
hope this helps you