1 . a2-b2=8

• A. $\pm 10$
• B. $10$
• C. $\pm 11$
• D. $11$

Answer: Option A

Explanation:

2 . x-aa2-b2=x-bb2-a2

• A. $a$
• B. $a$
• C. $a+b$
• D. $\frac{1}{2}\left(a+b\right)$

Answer: Option D

Explanation: