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:

3 . a2-b2=?

• A. (a+b)(a+b)
• B. (a+b)(a-b)
• C. (a+b)(b-a)
• D. কোনটিই নয়

Answer: Option B

Explanation:

4 . a2-b2=15

• A. 4
• B. 3
• C. 2
• D. 1

Answer: Option A

Explanation: