1 . a + b = 7, a - b = 3 হলে a2-b2 = কত?

• A. ১৭
• B. ১৯
• C. ২১
• D. ২৩

Answer: Option C

Explanation:

2 . 4a+b,10a-b

• A. $a-b$
• B. $a+b$
• C. $12\left(a^2-b^2\right)$
• D. $2$

Answer: Option D

Explanation:

3 . 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:

4 . a2+b2-c2+2aba2-b2+c2+2ac=?

• A. $a+b+c$
• B. $\frac{a+b-c}{a-b+c}$
• C. $\frac{a-b+c}{a+b-c}$
• D. $\frac{a+b-c}{a+b+c}$

Answer: Option B

Explanation:

5 . 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:

6 . a2-b2=8

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

Answer: Option A

Explanation:

7 . a-ba2-aba2-b2

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

Answer: Option D

Explanation:

8 . 24a+b,10a-b

• A. $a-b$
• B. $a+b$
• C. $12\left(a^2-b^2\right)$
• D. $2$

Answer: Option D

Explanation:

9 . 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:

10 . a2-b2

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

Answer: Option C

Explanation:

11 . a2-b2

• A. 16
• B. 32
• C. 36
• D. 49

Answer: Option B

Explanation:

12 . a2-b2

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

Answer: Option D

Explanation:

13 . a2-b2

• A. 34
• B. 39
• C. 36
• D. 49

Answer: Option A

Explanation:

14 . a2-b2

• A. 16
• B. 20
• C. 26
• D. 30

Answer: Option B

Explanation:

15 . a2-b2

• A. $(a + b)/(a-b)$
• B. $(a+b)\times (a-b)$
• C. $(a-b)/(a-b)$
• D. $ab$

Answer: Option B

Explanation:

16 . a2-b2 ও a3+b3

• A. a-b
• B. a+b
• C. $a^3+b^3$
• D. $a^2-b^{2 }$

Answer: Option B

Explanation:

17 . a2-b2=?

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

Answer: Option B

Explanation:

18 . a2-b2,a3-b3,a4+a2b2+b4

• A. 1
• B. 0
• C. a + b
• D. a - b

Answer: Option A

Explanation:

19 . a2-b2=15

• A. 4
• B. 3
• C. 2
• D. 1

Answer: Option A

Explanation:

20 . A=cotθ+cosecθ-1cotθ-cosecθ+1

• A. π
• B. 2π
• C. $\frac{2\mathrm{\pi }}{3}$
• D. 0

Answer: Option D

Explanation:

21 . a2-b2 =20; a+b=5,

• A. 3
• B. 15
• C. 5
• D. 4

Answer: Option D

Explanation: