1 . x-y=3 হলে x3-y3 -9xy এর মান-

• A. 27
• B. 18
• C. 9
• D. 6

Answer: Option A

Explanation:

2 . x2-y2,x2+xy+y2,x3-y3

• A. $\left(x^2-y^2\right)$
• B. $\left(x^{2}xy+y^2\right)$
• C. $x^3-y^3$
• D. $x+y$

Answer: Option A

Explanation:

3 . x-y=4

• A. –64
• B. +-64
• C. 64
• D. 128

Answer: Option C

Explanation:

4 . x2-y2,x2+xy+y2,x3-y3

• A. $\left(x^2-y^2\right)\left(x^2+xy+y^2\right)$
• B. $x^3-y^3$
• C. $x-y$
• D. $x+y$

Answer: Option A

Explanation:

5 . x2-y2,x3-y3,x4+x2y2+y4

• A. x+y
• B. x -y
• C. 0
• D. 1

Answer: Option D

Explanation: