Answer:
x²+1
Step-by-step explanation:
(x+1)(x²+1)/(x+1)
I'm not exactly sure, so if I'm wrong please correct me.
The equation is 2kg + x = s
↓
(can be any variable letter)
Question 1 Answer : x^2 - 2y^2
Question 2 Answer: x^2 - 36
400