1 . 12a+b2+a-b2=

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

Answer: Option A

Explanation:

2 . a+b=6

• A. 8
• B. 6
• C. 4
• D. 2

Answer: Option C

Explanation:

3 . a=15

• A. 30
• B. 10
• C. 15
• D. 20

Answer: Option B

Explanation:

4 . a=15

• A. 10
• B. 15
• C. 20
• D. 30

Answer: Option A

Explanation:

5 . 1/2a+b2+a-b2=

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

Answer: Option A

Explanation:

6 . a-b2

• A. 0
• B. 100
• C. 10
• D. 25

Answer: Option B

Explanation:

7 . a+b=7,ab=10

• A. 9
• B. 19
• C. 29
• D. 39

Answer: Option A

Explanation:

8 . 12a+b2+a-b2=কত ?  

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

Answer: Option A

Explanation:

9 . a-b2

• A. 50
• B. 125
• C. 5
• D. 1

Answer: Option D

Explanation: