7 is just adding.
8 is counting by odd numbers.
9 is a rotation
I hope this helps you out
Answer:
-4, -2, -3-2i, -3+2i
Step-by-step explanation:
The of the polynomial equation are those values of x, for which f(x)=0.
Consider equation

By zero product property,

Solve each equation:
1. 

2. 

The length of each side is about 9.85 feet