1 . a+b=7 এবং a2+b2=25

• A. 12
• B. 10
• C. 6
• D. None of them

Answer: Option A

Explanation:

2 . a-b=7,ab=60

• A. 180
• B. 168
• C. 169
• D. 170

Answer: Option C

Explanation:

3 . a2-b2=8

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

Answer: Option A

Explanation:

4 . a+b=7

• A. $12$
• B. $24$
• C. $36$
• D. $40$

Answer: Option B

Explanation:

5 . 2a2+b2=

• A. ${\left(a+b\right)}^2-{\left(a-b\right)}^2$
• B. ${\left(a-b\right)}^2-{\left(a+b\right)}^2$
• C. ${\left(a+b\right)}^2+{\left(a-b\right)}^2$
• D. ${\left(a+b\right)}^2-4ab$

Answer: Option C

Explanation:

6 . a2+b2=45

• A. 21
• B. 18
• C. 13
• D. 24

Answer: Option B

Explanation:

7 . a+b=7

• A. 12
• B. 24
• C. 36
• D. 40

Answer: Option B

Explanation:

8 . a2+b2=25

• A. 12
• B. 60
• C. 35
• D. কোনটিই না

Answer: Option B

Explanation: