1 . ab+ba=1

• A. $3$
• B. $1$
• C. $0$
• D. $-1$

Answer: Option C

Explanation:

2 . a+b,a2-b2

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

Answer: Option D

Explanation:

3 . a+b,a2-b2

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

Answer: Option D

Explanation:

4 . a+b+c=0

• A. abc
• B. 3abc
• C. 6abc
• D. 9abc

Answer: Option B

Explanation:

5 . a3+b3

• A. $0$
• B. $54$
• C. $9$
• D. $45$

Answer: Option A

Explanation:

6 . a+b=c

• A. $a^3$
• B. $a^2$
• C. $b^2$
• D. $c^2$

Answer: Option A

Explanation:

7 . a+b=5, ab=3

• A. 65
• B. 70
• C. 75
• D. 80

Answer: Option D

Explanation:

8 . a3+b3=

• A. $a^3+b^3+3a^{2}b+3a{b}^2$
• B. ${\left(a+b\right)}^3-3ab\left(a+b\right)$
• C. ${\left(a+b\right)}^3+3ab\left(a+b\right)$
• D. ${\left(a-b\right)}^3-3ab\left(a-b\right)$

Answer: Option B

Explanation:

9 . a3+b3

• A. 9
• B. 27
• C. 18
• D. 12

Answer: Option A

Explanation:

10 . a2-b2

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

Answer: Option D

Explanation:

11 . a3-b3,a3+b3

• A. (a-b)
• B. 1
• C. a+b
• D. $a^2+ab+b^2$

Answer: Option B

Explanation:

12 . a3-b3a+b

• A. $a-b$
• B. $a+b$
• C. $a^2-b^2$
• D. $a^2+b^2$

Answer: Option A

Explanation:

13 . a3+b3=16

• A. 1
• B. 2
• C. 3
• D. 4

Answer: Option D

Explanation: