BD Merit - Freelancing, BCS, Bank, Primary, Admission, NTRCA

1 . -8×-2

A. $4$
B. $4 i$
C. $- 4$
D. $- 4 i$

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Answer: Option C

Explanation:

√(-8) × √(-2)

{√(-1)×√8}×{√(-1)×√2}

(i×√8)×(i×√2)

i×√8×i×√2

(i^2)×√8×√2

{(√-1)^2}×2√2×√2

-1×4

-4

2 . -8×-2=

A. $4$
B. $4 i$
C. $- 4$
D. $- 4 i$

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Answer: Option C

Explanation:

৪১ তম বিসিএস প্রিলিমিনারি টেস্ট (19-03-2021)

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