1 . x4-x2+1=0

• A. $3$
• B. $1$
• C. $2$
• D. $4$

Answer: Option B

Explanation:

2 . 3x3-2x2+1=0

• A. 1
• B. -2
• C. 2
• D. কোনটিই নয়

Answer: Option B

Explanation:

3 . x4-x2+1=0

• A. 1
• B. 2
• C. $\sqrt{2}$
• D. 3

Answer: Option A

Explanation:

4 . x4-2x2+1=0

• A. 1
• B. 0
• C. 2
• D. 4

Answer: Option A

Explanation:

5 . x4-x2+1=0

• A. 1
• B. 2
• C. 0
• D. 3

Answer: Option A

Explanation:

6 . x4-2x2+1=0

• A. 1
• B. 0
• C. 2
• D. 4

Answer: Option A

Explanation:

7 . x4-x2+1=0

• A. 2
• B. 0
• C. 1
• D. 4

Answer: Option B

Explanation:

8 . x2+1=0

• A. $0$
• B. $x^2+1=0$
• C. $-1$
• D. $no real root$

Answer: Option D

Explanation: